@article{10_4153_CMB_1980_010_2,
     author = {Lee, Cheng-Shyong},
     title = {On {Some} {Generalization} of {Inequalities} of {Opial,} {Yang} and {Shum}},
     journal = {Canadian mathematical bulletin},
     pages = {71--80},
     year = {1980},
     volume = {23},
     number = {1},
     doi = {10.4153/CMB-1980-010-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1980-010-2/}
}