@article{1102985880, author = {Beesack, P. R. and Das, K. M.}, title = {Extensions of Opial's inequality.}, journal = {Pacific J. Math.}, volume = {27}, number = {3}, year = {1968}, pages = { 215-232}, language = {en}, url = {http://dml.mathdoc.fr/item/1102985880} }
Beesack, P. R.; Das, K. M. Extensions of Opial's inequality.. Pacific J. Math., Tome 27 (1968) no. 3, pp. 215-232. http://gdmltest.u-ga.fr/item/1102985880/