Österblom H., Casini M., Olsson O., Bignert A. 2006. Fish, seabirds and trophic cascades in the Baltic Sea. - Marine Ecology Progress Series 323: 233-238

Lif, M., Hjernquist, M.,.Olsson, O., Österblom, H. 2005. Long-term population trends in the Lesser Black-backed gull (Larus f. Fuscus) at Stora Karlsö and Lilla Karlsö and initial results on breeding success. — Ornis Svecica 15: 105-112

Österblom, H., van der Jeugd, HP & Olsson, O. 2004. The common guillemot of the Baltic Sea — survival and avian cholera. — Ibis 2004 146:

Olsson, O. & van der Jeugd, H.P. 2002. Survival in King penguins: temporal and sex-specific effects of environmental variability. - Oecologia 132: 509-516

Österblom, H. & Olsson, O. 2002. Change in feeding behaviour and breeding success in the Common Guillemot Uria aalge on the island of Stora Karlsö in the Baltic Sea. - Ornis Svecica 12:53-62

Österblom, H. Olsson, O. & Fransson, T. 2002. Bycatches of Common Guillemot (Uria lomvia) in the Baltic Sea gillnet fishery. - Biological Conservation 105: 309-319

Österblom, H., Bignert, A., Fransson, T. & Olsson, O. 2001. A decrease in fledging body mass in common guillemot Uria aalge chicks in the Baltic Sea. - Marine Ecology Progress Series 224: 305-309

Olsson, O., Anker-Nilsen, P & Bonnedahl, J. 2001. Mates switching and copulation behaviour in king penguins. - J. Avian Biol. 32: 139-145

Olsson, O., Nilsson, T. & Fransson, T. 2000. Geographical distribution, rates and causes of mortality in the Common Guillemot in the Baltic Sea. Swedish Environmental Protection Agency, Report 5057

Kooyman, G., Hull, C., Olsson, O., Robertson, R., Croxall, J., & Davis, L. 1999. Foraging patterns of polar penguins. In: Adams, N.J. & Slotow, R.H. (eds) Proc. 22 Int. Ornithol. Congr., Durban: 2021-2039. Johannesburg: BirdLife South Africa.

Olsson, O, Fransson, T. & Larsson, K. 1999. Post-fledging migration of common murre Uria aalge chicks in the Baltic Sea: management implications. - Ecography 22: 233-239.

Brodin, A., Olsson, O. & Clark, C.W. 1998. Modelling the breeding cycle of long lived birds: why do King penguins breed late. - The Auk 115: 767-771.
Olsson, O. (1998) Divorce in king penguins: asynchrony, expensive fat storing and ideal free mate choice. - Oikos 83:574-581.

Rodhouse, P.G., Olsson, O., Anker-Nilssen, P. & Murray, A.W.A. 1998. Cephalopod predation by the king penguin Aptenodytes patagonicus from South Georgia. - Marine Ecology Progress Series 168: 13-19.

Olsson, O., Wirtberg, J., Andersson, M. & Wirtberg, I. 1997. Wolf (Canis lupus) predation on moose (Alces alces) and roe deer (Capreolus capreolus) in south-central Scandinavia. - Wildlife Biology 3: 13-25.

Olsson, O. & North, A.W. 1997. Diet of the king penguin (Aptenodytes patagonicus) during three summers at South Georgia. - Ibis 139: 504-512.

Olsson, O. & Brodin, A. 1997. Changes in King penguin breeding cycle in response to food availability. - The Condor 99: 994-997.

Olsson, O. 1997a. Effects of food availability on fledging conditions and post-fledging survival in king penguin chicks. - Polar Biology 18: 161-165.

Olsson, O. 1997b. Clutch abandonment: a state dependent decision in king penguins. - Journal of Avian Biology 28: 264-267.

Olsson, O. 1996. Seasonal effects of timing and reproduction in the king penguin: a unique breeding cycle. - Journal of Avian Biology 27: 7-14.