1] mr Ozren Žolja Towards the Flora of the Republika Srpska Database" - Forest Science for Sustainable Development of Forests
25 Years of Forestry of the Republic of Srpska, 11.10.2017.
(https://ekonferencije.com/hr/rad/towards-the-flora-of-the-repub/5531)

2] mr Ozren Žolja Influence of different harvesting methods on the damages on the standing trees" - Forest Science for Sustainable Development of Forests
25 Years of Forestry of the Republic of Srpska, 07.09.2017.
(https://ekonferencije.com/hr/rad/influence-of-different-harvest/5397)