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@article{MS2_1969__25_166117, author = {J.A. Crenshaw}, title = {Extreme {Positive} {Linear} {Operators.}}, journal = {Mathematica Scandinavica}, pages = {195--217}, publisher = {mathdoc}, volume = {25}, year = {1969}, zbl = {0192.46702}, url = {http://geodesic.mathdoc.fr/item/MS2_1969__25_166117/} }
J.A. Crenshaw. Extreme Positive Linear Operators.. Mathematica Scandinavica, Tome 25 (1969), pp. 195-217. http://geodesic.mathdoc.fr/item/MS2_1969__25_166117/