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@article{PORMA_1961__20_1_114849, author = {Marcus, Marvin and Khan, N.A.}, title = {Some generalizations of {Kantorovich's} inequality}, journal = {Portugaliae mathematica}, pages = {33--38}, publisher = {mathdoc}, volume = {20}, number = {1}, year = {1961}, mrnumber = {0130261}, zbl = {0118.25902}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1961__20_1_114849/} }
Marcus, Marvin; Khan, N.A. Some generalizations of Kantorovich's inequality. Portugaliae mathematica, Tome 20 (1961) no. 1, pp. 33-38. http://geodesic.mathdoc.fr/item/PORMA_1961__20_1_114849/