Voir la notice de l'article provenant de la source Math-Net.Ru
@article{IVM_1959_2_a11, author = {G. S. Litvinchuk}, title = {Integral equations with many-valued kernels}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {128--137}, publisher = {mathdoc}, number = {2}, year = {1959}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1959_2_a11/} }
G. S. Litvinchuk. Integral equations with many-valued kernels. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 2 (1959), pp. 128-137. http://geodesic.mathdoc.fr/item/IVM_1959_2_a11/