@article{MZM_1982_32_2_a5,
     author = {V. I. Plotnikov and M. I. Sumin},
     title = {Necessary conditions in a nonsmooth problem of optimal control},
     journal = {Matemati\v{c}eskie zametki},
     pages = {187--197},
     publisher = {mathdoc},
     volume = {32},
     number = {2},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1982_32_2_a5/}
}