%0 Journal Article %A O. O. Vasilieva %T Optimal control methods for conservation biology: a case of non-harvesting utility %J The Bulletin of Irkutsk State University. Series Mathematics %D 2014 %P 44-61 %V 8 %I mathdoc %U http://geodesic.mathdoc.fr/item/IIGUM_2014_8_a3/ %G en %F IIGUM_2014_8_a3