@article{GDZPPN002037912, title = {On Opial-type inequalities in two varaiables.}, journal = {Aequationes mathematicae}, volume = {38}, year = {1989}, pages = {236-244}, zbl = {0684.26006}, url = {http://dml.mathdoc.fr/item/GDZPPN002037912} }
Cheung, Wing-Sum. On Opial-type inequalities in two varaiables.. Aequationes mathematicae, Tome 38 (1989) pp. 236-244. http://gdmltest.u-ga.fr/item/GDZPPN002037912/