@article{10_4153_CMB_1976_037_4,
     author = {Zaidman, S.},
     title = {A {Convexity} {Result} for {Weak} {Differential} {Inequalities}},
     journal = {Canadian mathematical bulletin},
     pages = {235--244},
     year = {1976},
     volume = {19},
     number = {2},
     doi = {10.4153/CMB-1976-037-4},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1976-037-4/}
}