@article{DE_1995_31_11_a2,
     author = {A. P. Afanas'ev},
     title = {A first-order local variational problem for nonlinear optimal control problems with mixed constraints},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1796--1802},
     publisher = {mathdoc},
     volume = {31},
     number = {11},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1995_31_11_a2/}
}