@article{DE_1993_29_3_a2,
     author = {I. A. Kuzin},
     title = {On equations with noncompact indefinite operators},
     journal = {Differencialʹnye uravneni\^a},
     pages = {392--401},
     publisher = {mathdoc},
     volume = {29},
     number = {3},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1993_29_3_a2/}
}