Voir la notice de l'article provenant de la source Math-Net.Ru
@article{AL_1999_38_5_a3, author = {S. I. Mardaev}, title = {Modal positive operators}, journal = {Algebra i logika}, pages = {585--597}, publisher = {mathdoc}, volume = {38}, number = {5}, year = {1999}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1999_38_5_a3/} }
S. I. Mardaev. Modal positive operators. Algebra i logika, Tome 38 (1999) no. 5, pp. 585-597. http://geodesic.mathdoc.fr/item/AL_1999_38_5_a3/