@article{ZVMMF_1970_10_4_a5,
     author = {Fam Hyu Shak},
     title = {Singular controls in discrete systems},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {857--867},
     publisher = {mathdoc},
     volume = {10},
     number = {4},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1970_10_4_a5/}
}