@article{IM2_1970_4_3_a11,
     author = {V. I. Plotnikov},
     title = {Existence theorems on optimizing functions for optimal systems with distributed parameters},
     journal = {Izvestiya. Mathematics },
     pages = {697--719},
     publisher = {mathdoc},
     volume = {4},
     number = {3},
     year = {1970},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1970_4_3_a11/}
}