@article{ELMA_1989__44_3_141469,
     author = {Stephen J. Gardiner},
     title = {Convexity and subharmonicity.},
     journal = {Elemente der Mathematik},
     pages = {145--150},
     year = {1989},
     volume = {44},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1989__44_3_141469/}
}