@article{DE_1990_26_2_a25,
     author = {A. M. Minkin},
     title = {Eigenfunction expansion of a class of nonsmooth differential operators},
     journal = {Differencialʹnye uravneni\^a},
     pages = {356--358},
     publisher = {mathdoc},
     volume = {26},
     number = {2},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1990_26_2_a25/}
}