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@article{PIM_1969_N_S_09_23_a9, author = {P. S. Bullen}, title = {On {An} {Inequality} {Of} {Tchakaloff}}, journal = {Publications de l'Institut Math\'ematique}, pages = {69 }, publisher = {mathdoc}, volume = {_N_S_09}, number = {23}, year = {1969}, url = {http://geodesic.mathdoc.fr/item/PIM_1969_N_S_09_23_a9/} }
P. S. Bullen. On An Inequality Of Tchakaloff. Publications de l'Institut Mathématique, _N_S_09 (1969) no. 23, p. 69 . http://geodesic.mathdoc.fr/item/PIM_1969_N_S_09_23_a9/