Voir la notice de l'article provenant de la source Math-Net.Ru
@article{FAA_1968_2_2_a10, author = {G. M. Vainikko and Yu. B. Umanskii}, title = {Regular operators}, journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a}, pages = {87--88}, publisher = {mathdoc}, volume = {2}, number = {2}, year = {1968}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/FAA_1968_2_2_a10/} }
G. M. Vainikko; Yu. B. Umanskii. Regular operators. Funkcionalʹnyj analiz i ego priloženiâ, Tome 2 (1968) no. 2, pp. 87-88. http://geodesic.mathdoc.fr/item/FAA_1968_2_2_a10/