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@article{AM2_1971__6_136183, author = {P.S. BULLEN}, title = {Rado's {Inequality}}, journal = {Aequationes mathematicae}, pages = {149--156}, publisher = {mathdoc}, volume = {6}, year = {1971}, zbl = {0222.26016}, url = {http://geodesic.mathdoc.fr/item/AM2_1971__6_136183/} }
P.S. BULLEN. Rado's Inequality. Aequationes mathematicae, Tome 6 (1971), pp. 149-156. http://geodesic.mathdoc.fr/item/AM2_1971__6_136183/