@article{MZM_1970_7_3_a1,
     author = {G. K. Zakharov and V. I. Plotnikov},
     title = {Necessary time-optimality conditions in the case of two control parameters with different functional natures},
     journal = {Matemati\v{c}eskie zametki},
     pages = {273--280},
     publisher = {mathdoc},
     volume = {7},
     number = {3},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1970_7_3_a1/}
}