@article{DE_1997_33_2_a14,
     author = {M. Yu. Kokurin},
     title = {On the regularization of singular optimal control problems for linear equations with selfadjoint operators},
     journal = {Differencialʹnye uravneni\^a},
     pages = {249--256},
     publisher = {mathdoc},
     volume = {33},
     number = {2},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1997_33_2_a14/}
}