@article{10_4153_CMB_1987_038_1,
     author = {Pe\v{c}ari\'c, J. E. and Beesack, P. R.},
     title = {On {Knopp's} {Inequality} for {Convex} {Functions}},
     journal = {Canadian mathematical bulletin},
     pages = {267--272},
     year = {1987},
     volume = {30},
     number = {3},
     doi = {10.4153/CMB-1987-038-1},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1987-038-1/}
}