@article{GDZPPN002483459, title = {Kantorovic Operators of Second Order.}, journal = {Monatshefte f\"ur Mathematik}, volume = {95}, year = {1983}, pages = {33-44}, zbl = {0497.41011}, url = {http://dml.mathdoc.fr/item/GDZPPN002483459} }
Nagel, Josef. Kantorovic Operators of Second Order.. Monatshefte für Mathematik, Tome 95 (1983) pp. 33-44. http://gdmltest.u-ga.fr/item/GDZPPN002483459/