%0 Journal Article %A O. V. Vasiliev %T Optimality of singular boundary controls in systems with distributed parameters %J Diskretnyj analiz i issledovanie operacij %D 1979 %P 4-13 %N 18 %I mathdoc %U http://geodesic.mathdoc.fr/item/DA_1979_18_a0/ %G ru %F DA_1979_18_a0