Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{CMUC_1963__4_4_a0, author = {Marek, Ivo}, title = {A note on $K$-positive operators}, journal = {Commentationes Mathematicae Universitatis Carolinae}, pages = {137--146}, publisher = {mathdoc}, volume = {04}, number = {4}, year = {1963}, mrnumber = {0167843}, zbl = {0201.16704}, language = {en}, url = {http://geodesic.mathdoc.fr/item/CMUC_1963__4_4_a0/} }
Marek, Ivo. A note on $K$-positive operators. Commentationes Mathematicae Universitatis Carolinae, Tome 04 (1963) no. 4, pp. 137-146. http://geodesic.mathdoc.fr/item/CMUC_1963__4_4_a0/