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@article{MOMA_1983__95_178106, author = {Josef Nagel}, title = {Kantorovic {Operators} of {Second} {Order.}}, journal = {Monatshefte f\"ur Mathematik}, pages = {33--44}, publisher = {mathdoc}, volume = {95}, year = {1983}, zbl = {0497.41011}, url = {http://geodesic.mathdoc.fr/item/MOMA_1983__95_178106/} }
Josef Nagel. Kantorovic Operators of Second Order.. Monatshefte für Mathematik, Tome 95 (1983), pp. 33-44. http://geodesic.mathdoc.fr/item/MOMA_1983__95_178106/