@article{GDZPPN002025299, title = {Rado's Inequality}, journal = {Aequationes mathematicae}, volume = {7}, year = {1971}, pages = {149-156}, zbl = {0222.26016}, url = {http://dml.mathdoc.fr/item/GDZPPN002025299} }
BULLEN, P.S. Rado's Inequality. Aequationes mathematicae, Tome 7 (1971) pp. 149-156. http://gdmltest.u-ga.fr/item/GDZPPN002025299/