@article{ELMA_1991__46_2_141503,
     author = {J.E. Pecaric and W. Janous},
     title = {On an integral inequality.},
     journal = {Elemente der Mathematik},
     pages = {55--57},
     publisher = {mathdoc},
     volume = {46},
     number = {2},
     year = {1991},
     zbl = {0735.26012},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1991__46_2_141503/}
}