@article{DE_1977_13_8_a20,
     author = {V. P. Danilovich and I. M. Koval'chik},
     title = {The {Cauchy} formula for linear equations with functional derivatives},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1509--1511},
     publisher = {mathdoc},
     volume = {13},
     number = {8},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_8_a20/}
}