@article{DE_1976_12_4_a6,
     author = {S. T. Zavalishchin},
     title = {Singular solutions in problems of maximum optimization of dynamical systems with a quadratic quality criterion},
     journal = {Differencialʹnye uravneni\^a},
     pages = {637--644},
     publisher = {mathdoc},
     volume = {12},
     number = {4},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1976_12_4_a6/}
}