@article{104945, author = {Ivo Marek}, title = {A note on $K$-positive operators}, journal = {Commentationes Mathematicae Universitatis Carolinae}, volume = {004}, year = {1963}, pages = {137-146}, zbl = {0201.16704}, mrnumber = {0167843}, language = {en}, url = {http://dml.mathdoc.fr/item/104945} }
Marek, Ivo. A note on $K$-positive operators. Commentationes Mathematicae Universitatis Carolinae, Tome 004 (1963) pp. 137-146. http://gdmltest.u-ga.fr/item/104945/
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