@article{DE_1995_31_1_a21,
     author = {A. V. Bulatov},
     title = {On the construction of a conjugate problem},
     journal = {Differencialʹnye uravneni\^a},
     pages = {156--157},
     publisher = {mathdoc},
     volume = {31},
     number = {1},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1995_31_1_a21/}
}