Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1982_263_2_a11, author = {A. V. Chechkin}, title = {Ultraoperators in the theory of information systems}, journal = {Doklady Akademii Nauk}, pages = {302--305}, publisher = {mathdoc}, volume = {263}, number = {2}, year = {1982}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1982_263_2_a11/} }
A. V. Chechkin. Ultraoperators in the theory of information systems. Doklady Akademii Nauk, Tome 263 (1982) no. 2, pp. 302-305. http://geodesic.mathdoc.fr/item/DAN_1982_263_2_a11/