@article{10_4153_CMB_1968_010_7,
     author = {Lee, Cheng-Ming},
     title = {On a {Discrete} {Analogue} of {Inequalities} of {Opial} and {Yang}},
     journal = {Canadian mathematical bulletin},
     pages = {73--77},
     year = {1968},
     volume = {11},
     number = {1},
     doi = {10.4153/CMB-1968-010-7},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1968-010-7/}
}