Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MAT_1974_18_1_a3, author = {J. G. Stampfli}, title = {Hyponormal operators}, journal = {Matematika}, pages = {90--94}, publisher = {mathdoc}, volume = {18}, number = {1}, year = {1974}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MAT_1974_18_1_a3/} }
J. G. Stampfli. Hyponormal operators. Matematika, Tome 18 (1974) no. 1, pp. 90-94. http://geodesic.mathdoc.fr/item/MAT_1974_18_1_a3/