@article{DE_1980_16_2_a16,
     author = {Yu. K. Lando and Yu. A. Bykadorov},
     title = {Nonnormally solvable and controllable integro-differential correspondences},
     journal = {Differencialʹnye uravneni\^a},
     pages = {344--349},
     publisher = {mathdoc},
     volume = {16},
     number = {2},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1980_16_2_a16/}
}