@article{PIM_1989_N_S_45_59_a20,
     author = {Vladimir Jankovi\'c},
     title = {The {Linear} {Optimal} {Control} {Problem} with {Variable} {Endpoints}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {133 },
     publisher = {mathdoc},
     volume = {_N_S_45},
     number = {59},
     year = {1989},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1989_N_S_45_59_a20/}
}