@article{DE_1987_23_9_a2,
     author = {P. P. Zabreiko and T. A. Makarevich},
     title = {A generalization of the {Banach--Cacciopolli} principle to operators in pseudometric spaces},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1497--1504},
     publisher = {mathdoc},
     volume = {23},
     number = {9},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1987_23_9_a2/}
}