@article{IM2_1972_6_3_a11,
     author = {V. I. Plotnikov},
     title = {Necessary and sufficient optimality conditions and uniqueness conditions for optimizing functions for control systems of general type},
     journal = {Izvestiya. Mathematics },
     pages = {649--676},
     publisher = {mathdoc},
     volume = {6},
     number = {3},
     year = {1972},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1972_6_3_a11/}
}