Nilson, A., Kiviste, A., Korjus, H., Mihkelson, S., Etverk, I. & Oja, T. , 1999. Impact of recent and future climate change on Estonian forestry and adaptation tools. Climate Research 12:205-214..
Mander, Ü., Oja, T., Lõhmus, K. 1999. Nutrient transformation in riparian buffer zones: modelling approach. In: Ecosystems and Sustainable Development II. Advances in Ecological Sciences Vol. 2, WIT Press, Southampton, Boston, pp. 3-13.
Bhatti, J.S., Foster, N.W., Oja, T., Moayeri, M.H., Arp, P.A. 1998. Modelling potential biomass productivity of jack pine forest stands. Can. J. Soil Sci. 78:105-113.
Oja, T., Arp, P.A. 1998. Assessing atmospheric S and N loads critical to the maintenenance of upland forest soils. In: Ed. D. Maynard. Sulfur in the Environment. Marcel Dekker, NY, Basel, Hong-Kong, pp. 337-363.
Oja, T., Arp, P.A. 1997. A forest soil vegetation atmosphere model (ForSVA), II: application to northern tolerant hardwoods. Ecological Modelling, 95: 225-247.
Arp, P.A., Oja, T. 1997. A forest soil vegetation atmosphere model (ForSVA), I: concepts. Ecological Modelling, 95: 211-224.
Oja, T., Arp, P.A. 1996. Nutrient cycling and biomass growth at a North American hardwood site in relation to climate change: ForSVA assessments. Climate Change 34: 239-251.
Arp, P.A., Oja, T., Marsh, M. 1996. Calculating critical S and N loads and current exceedances for upland forests in Southern Ontario, Canada. Canadian Journal of Forest Research, 26: 696-709.
Oja, T., Yin, X., Arp, P.A.. 1995. The forest modelling series ForM-S: applications to the Solling spruce site. Ecological Modelling 83:207-217.
de Vries, W. , Posch, M., Oja, T., van Oene, H., Kros, J., Warfvinge, P., Arp, P.A. 1995. Modelling critical loads for the Solling spruce site. Ecological Modelling 83: 283-293.
Mander, Ü., Oja, T., Järvet, A. 1994. Groundwater quality and eco-engineering measures in the Selja River catchment area, Estonia. Future groundwater resources at risk (Proceedings of the Helsinki Conference, June 1994). IAHS Publication No. 222, pp. 157-167.
Oja, T. 1991. Horizontal distribution of root systems of Larix cajanderi (in Russian with English Summary). in: A.Leito, R.Mänd, T.Oja, J.Paal, T.Talvi. Ecosystem studies on the Koni peninsula (Magadan nature reserve), Tallinn, pp. 107-117, 216-217.
Lõhmus, K., Lasn, R., Oja, T. 1991. The influence of climate and soil physical condition on growth and morphology of Norway spruce roots. B.L.Michael and H. Persson (Eds). Plant Roots and their Environment,. Development of Agricultural and Managed Forest Ecology, 24, Elsevier, pp. 233-239.
Lõhmus, K., Oja, T., Lasn, R. 1989. Specific root area - a soil characteristic. Plant and Soil, 119:245-249.
Oja, T. 1989. Modelling of the succession (temporal pattern) of tree stands (in Russian with English Summary). in: J.Paal, T.Oja, S.Kolodjazhnyi. Spatial and temporal continuum of vegetative cover, Tallinn, pp. 119-148, 184-187.
Lindpere, A. , Milius, A., Starast, H., Oja, T. 1988. Total phosphorus, total nitrogen and chlorophyll A in lake Peipsi-Pihkva. - Dynamics and Ecology of Wetlands and Lakes in Estonia, Tallinn, pp. 227-240.
Lõhmus, K., Lasn, R., Oja, T. 1986. Growth of Norway spruce roots depending on soil quality ( in Russian with English Summary). Potschvovedenije (Soviet Soil Science), 6:89-97.
Oja, T. 1986. A simple adaptive model of plant growth II: model analysis (in Russian with English Summary). Proceedings of Estonian Academy of Sciences (Biology), 35(1):16-29.
Oja, T. 1985. A simple adaptive model of plant growth I: model discription (in Russian with English Summary). Proceedings of Estonian Academy of Sciences (Biology), 34(4):289-294.
Oja, T., K.Lõhmus. 1985. Horisontal distribution of Norway spruce roots in middle-aged stand (in Russian with English Summary), Lesovedenie (Soviet Forestry), 1:44-47.
Kull, K., Oja, T. 1984. Structure of physiological growth models (in Russian with English Summary). Proceedings of Estonian Academy of Sciences (Biology), 33(1):34-41.
Koppel, A., Oja, T. 1984. Regime of diffuse solar radiation in an individual Norway spruce (Picea abies (L.) Karst.) crown. Photosynthetica, 18(4):529-535.
Lõhmus, K., Oja, T. 1983. Methods to study belowground part of forest stand (phytomass distribution in Norway spruce) (in Russian with English Summary). Lesovedenie (Soviet Forestry), 4:56-62.
Oja, T. 2000. Keskkonnaseire – milleks? Eesti Loodus, 12, 499-501.
Oja, T. 2000. Critical Loads in Estonia. . In: M. Holmberg (Ed.), Uncertainty of Critical Loads in the Baltic Countries, TEMA: NORD, 544. 23-27.
Oja, T., Kull, A., Tamm, T. 2000. Critical tresholds to atmospheric pollution and landscape sensitivity. In: M. Holmberg (Ed.), Uncertainty of Critical Loads in the Baltic Countries, TEMA: NORD, 544. 46-49
Oja, T. 2000. Possible changes in Nutrient Fluxes and Nutrient Availability in Estonian Forests under predicted Climate Change. Climate Change Impacts and Responses. Proceedings of the Conference on National Assessment Results of Climate Change, San-Jose, Costa Rica, March 25-28, 1998. (Ed. N. Mimura). pp. 401-410.
Nilson, A., Kiviste, A., Korjus, H., Mihkelson, S., Etverk, I. & Oja, T. , 2000. Impact of recent and future climate change on Estonian forestry and adaptation tools. Climate Change Impacts and Responses. Proceedings of the Conference on National Assessment Results of Climate Change, San-Jose, Costa Rica, March 25-28, 1998. (Ed. N. Mimura). pp. 373-400.
Prede, M., Ott, I., Kisand, A., Laugaste, R., Mäemets, H., Timm, H., Järvalt, A., Kirt, E., Oja, T., (Ed. Maastik, A., 1999. Lakescape of Otepää: Past, Present, and Future. Otepää, 24 p.
Prede, M., Ott, I., Kisand, A., Laugaste, R., Mäemets, H., Timm, H., Järvalt, A., Kirt, E., Oja, T., (Ed. Maastik, A., 1999. Otepää järvemaastik eile, täna ja homme. Otepää, 24 p.
Mander, Ü., Oja, T. 1999. Eesti maastike omapära ja sellest tulenevad ökoloogilised iseärasused. Loodusliku mitmekesisuse kaitse viisid ja vahendid. (Toim. T. Frey), IM Saare, lk. 14-30.
Oja, T. 1998. Possible changes in nutrient fluxes and availability in Estonian forests. In. Tarand, A., Kallaste, T. (Eds). Country case study on climate change impacts and adaptation assessments in the Republic of Estonia. Ministry of the Environment, SEI-Tallinn, Tallinn, pp. 57-60.
Oja, T., Kull, A., Tamm, T. 1998. Looduslike maastike õhusaaste taluvus. Keskkonnaseire 96. Eesti Vabariigi Keskkonnaministeerium, Info- ja Tehnokeskus, Tallinn, lk. 34-37.
Oja, T., Kull, A., Tamm, T. 1997. Eesti looduslike taimekoosluste vastupanuvõime N ja S saastele. Eesti VII Ökoloogiakonverentsi lühiartiklid. Tartu, lk. 155-159.
Oja, T., Tamm, T. 1996. Looduslike maastike õhusaaste taluvus. Keskkonnaseire 95. Eesti Vabariigi Keskkonnaministeerium, Info- ja Tehnokeskus, Tallinn 1996,.lk. 28-33.
Oja, T., Tamm, T. 1996. Mapping critical thresholds in Estonia: current progress and future developments. Critical levels for Ozone in Europe: Testing and Finalizing the Concepts. UN ECE Workshop Report. pp. 293-297.
Oja, T., Arp, P.A. 1995. Dynamic modeling and the analysis of critical S and N loads. Mapping and modelling of critical loads for nitrogen - a workshop report. Institute of Terrestrial Ecology, Midlothian, pp. 154 - 157.
Arp, P.A., Oja, T., Marsh, M. 1995. Critical S and N loads and their current exceedances in Southern Ontario: preliminary results. Mapping and modelling of critical loads for nitrogen - a workshop report. Institute of Terrestrial Ecology, Midlothian, pp. 170 - 172.
Oja, T., Arp. P.A. 1994. ForSVA - a tool to analyze patterns in nutrient cycling as affected by atmospheric deposition: a maritime example. In: Proceedings of the workshop on ecological monitoring and research in the coastal environment of the Atlantic Maritime Ecozone. March 9-11, 1994. Huntsman Marine Laboratory. B.M. MacKinnon, M.D.B.Burt (Eds.). Environment Canada - Atlantic Region, Occasional Report No. 4. p.75-80.
Arp, P.A., Oja, T. 1994. The ForM-S forest modelling study: its relation to ecosystem monitoring with application for the maritime region. in: Proceedings of the workshop on ecological monitoring and research in the coastal environment of the Atlantic Maritime Ecozone. March 9-11, 1994. Huntsman Marine Laboratory. B.M. MacKinnon, M.D.B.Burt (Eds.). Environment Canada - Atlantic Region, Occasional Report No. 4. p.17-23.
Oja, T. 1994. Keskkonnaruumi kontseptsioon alahoidliku arengu sotsiaalutoopia nurgakivina. Kaasaegse ökoloogia probleemid. Alalhoidlik areng ja looduskeskne elulaad. Eesti VI Ökoloogiakonverentsi lühiartiklid, Tartu, 24.-26. aprill 1994, lk. 14-18.
Oja, T. 1993. System analysis approach in environmental planning and policy: designing sustainable society (a case study - Estonia's own way). Proceedings of the IV International Conference on System Analysis Approach Energy, Environment and Natural Resource Management in the Baltic Sea Region, Tallinn, May 18-21, 1993, NORD 1993: 189 -196.
Arp, P.A., Oja, T. 1992. Acid sulfate/nitrate loading of forest soils: forest biomass and nutrient cycling modelling. Critical Loads for Nitrogen - a workshop report. NORD 1992:41, pp.307-358.
Jagomägi, J., Kikas, J., Kull, K., Mander, Ü., Oja, T., Olesk, P., Roosve, R. 1991. Eesti oma tee. Tartu Ülikooli Noorte Geograafide Sügiskooli materjalid, Tartu, pp. 44-62.
Oja, T. 1986. Konkurents taimede vahel mudelisti pilgu läbi. - Biosüsteemide kooseksisteerimise teooria, Schola biotheoretica XII, Tartu, pp. 36-39.
Oja, T. 1985. Models of stand development (in Russian). Estonian Academy of Sciences, Tallinn, 58 pp.
Oja, T. 1984. Ökoloogilise suktsessiooni teooria. Teooria ja mudelid eluteadustes. Tartu, pp. 206-214.
Oja, T. 1984. Üks mudelilugu ehk sõnalisest taimekasvatamisest. Eesti Loodus, 10:646-650.
Oja, T. 1984. Modelleerimine ökoloogias. Eesti Loodus, 7:438-443.
Oja, T. 1984. Metsa suktsessiooni ja horisontaalse struktruuri imiteerimisest. ELUS Aastaraamat, 69:110-117.
Oja, T. 1983. Elu teooriate eetikast. - Raku teooria. Schola biotheoretica IX, Tartu, pp. 125-130.
Mander, Ü., Oja, T. and Kull, A. 1996. Modelling nutrient transformation in riparian buffer strips: catchment scale approach. in: Buffer zones. Their processes and potential in water protection. Conference handbook. p. 50.
Oja, T. 1996. Model analysis of nutrient cycling in forest ecosystems as affected by environment and management scenarios. Ecological Summit, Copehagen, August 19-23, 1996, Abstracts.
Mander Ü. and Oja, T. 1996. Planning riparian buffer zones in rural landscapes based on model analysis of nutrient cycling in riparian forest ecotones. Ecological Summit, Copehagen, August 19-23, 1996, Abstracts.
Oja, T., Kull, A. and Tamm, T. 1996. Atmospheric deposition and Landscape Change. IALE International Conference "Perspectives of Rural Landscapes in Europe", Pärnu, 20-23.06.1996, Abstracts, pp. 40-41.
Oja, T. 1995. Juured puistu aineringe mudelites. Juureökoloogia seminar, Tartu 12. juuni 1995. Teesid. lk. 40-41.
Oja, T., Lõhmus, K. 1995. Hariliku kuuse juured mullas: struktuur ja asetus. Juureökoloogia seminar, Tartu 12. juuni 1995. Teesid. lk. 41-45.
Arp, P.A. and Oja, T. 1994. Critical S and N loads and their current exceedances in Southern Ontario: preliminary results. Abstracts of the "The New Economy", Green needs and opportunities. Environment and Energy Conference of Ontario. November 15-16, 1994. Metro Toronto Convention Centre. Toronto. p.74, 118-120.
Arp, P.A., Oja, T., 1994. Impacts of atmospheric deposition and climate change on forest productivity (biomass growth) and nutrient cycling: evaluations with the forest soil-atmosphere-vegetation model ForSVA. In: Abstracts of the 16th International Meeting for Specialists in Ait Pollution Effects on Forest Ecosystems "Air Pollution and multiple stress", September 7-9, 1994, Fredricton, N.B., p.2.
Oja, T. 1988. Modelling of plant competition (in Russian). - Mathematical models in rationale use of natural resources. Abstracts of an all-union conference, Rostov -on-Don, pp. 104-105.
Lõhmus, K., R. Lasn, Oja, T. 1988. Growth and morphology of Norway spruce roots depending on climatic and physical soil conditions. - Abstracts of the International Society of Root Research Symposium on Plant Roots and their Environment, Uppsala, 2:11, 2 pp.
Timm, V., Timm, T., Oja, T., Kikas, H., Haldna, M. 1987. Dreissena polymorpha in south-western part of lake Peipsi (in Russian). - Biological resources of inland waterbodies of the Baltic region. Proceedings of the 22. scientific conference on research of the Baltic waterbodies, Vilnius, pp. 192-195.
Milius, A., Lindpere, A., Starast, H., Simm, H., Oja, T. 1986. Use and verification of a model of trophic state of small light-watered lakes (in Russian). - Complex methods of environmental controle. Abstracts of a conference of experts from countries of economic union, Moscow, pp. 92.
Oja, T. 1986. A flexible database systems used in hydrochemistry and hydrology (in Russian). - Principles and methods of ecoinformatics. Materials of all-union conference, Moskva, 1986, pp. 295-296.
Oja, T. 1985. Some mathematical ways to solve ecological problems (in Russian). - Stability and energetic effectiveness of forest ecosystems. Abstracts of an all-union conference, Tartu, pp. 179-182.
Oja, T. 1985. Models of stand development stabilization (in Russian). - Stability and energetic effectiveness of forest ecosystems. Abstracts of an all-union conference, Tartu, pp. 94-95.
Oja, T. 1985. Mathematical models of ecological sucession (in Russian). - Mathematical modelling in biogeocoenology. Abstracts of an all-union workshop, Petrozavodsk, pp. 55-56.
Oja, T. 1985. Markov processes as succession models (in Russian). - Theoretical and applied problems of mathematics. Abstracts of republican conference, Tartu, pp. 110-112.
Oja, T. 1985. Suktsessiooni mudelid. - Stohhastilised mudelid bioloogias, Schola biotheoretica XI, Tartu, pp. 48-55.
Oja, T. 1985. Siseveekogude modelleerimisest. - Keskkonnakaitse infoseeria XIV, 1:9-12.
Oja, T. 1984. Elu vormi teooria. - Orgaanilise vormi teooria. Schola biotheoretica X, Tartu, pp. 165.
Oja, T. 1984. K›rgema taime kasv. ELUS Aastaraamat, 69:145-146.
Oja, T. 1983. Plain structure of Norway spruce stand and its changes while forest succession. (in Russian) Proceedings of Lithuanian Academy of Agriculture "Stand growth and structure", Kaunas- Akademiya, pp. 23.
Frey, T., Oja, T. 1982. Possibilities for ecological prediction of environment (in Russian). Problems of contemporary ecology. Abstracts of the II ecological conference. Tartu, p 31-33.
Oja, T. 1980. Puistu dünaamikast imitatsioonmudelis SJABO. Bioloogiline produktiivsus ja seda määravad tegurid. Noorte teadlaste ettekannete päeva teesid. Tartu, lk. 32-35.
Oja, T. 1980. Distribution of plant biomass in variable environment (in Russian). Abstracts of the conference "Theoretical and applied porblems of mathematics", Tartu, pp. 249-251.
Oja, T. 1979. Suktsessioonist. Kohanemine ja kohasumine eluslooduses. Noorte teadlaste ettekannete päeva teesid. Tartu, lk. 14-17.
Oja, T. 1979. A model of spruce growth (in Russian). Formation of etalon plantations. Part II. Picea III. Kaunas-Girionis, pp. 80-81.
Oja, T. 1978. Simulation of stand development in temporary climate. Problems of contemporary ecology. Proceedings of the I ecological conference, Tartu, 1978, pp. 59-61.
Oja, T. 1977. Mathematical modelling of forest growth (in Russian). Materials of students conference, Tartu, 1977, pp. 67-71.
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