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@article{PORMA_1969__28_1_115081, author = {Hsiang, Fu Cheng}, title = {An integral inequality}, journal = {Portugaliae mathematica}, pages = {63--66}, publisher = {mathdoc}, volume = {28}, number = {1}, year = {1969}, mrnumber = {0281859}, zbl = {0216.09406}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1969__28_1_115081/} }
Hsiang, Fu Cheng. An integral inequality. Portugaliae mathematica, Tome 28 (1969) no. 1, pp. 63-66. http://geodesic.mathdoc.fr/item/PORMA_1969__28_1_115081/