@article{PIM_1990_N_S_47_61_a12,
     author = {Vladimir Jankovi\'c},
     title = {Linear {Optimal} {Control} {Problem} in {Plane}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {88 },
     publisher = {mathdoc},
     volume = {_N_S_47},
     number = {61},
     year = {1990},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1990_N_S_47_61_a12/}
}