@article{DA_1979_18_a0,
     author = {O. V. Vasiliev},
     title = {Optimality of singular boundary controls in systems with distributed parameters},
     journal = {Diskretnyj analiz i issledovanie operacij},
     pages = {4--13},
     publisher = {mathdoc},
     number = {18},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DA_1979_18_a0/}
}