@article{ZVMMF_2007_47_9_a5,
     author = {Sh. Sh. Yusubov},
     title = {Necessary optimality conditions for singular controls},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1506--1511},
     publisher = {mathdoc},
     volume = {47},
     number = {9},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_2007_47_9_a5/}
}