@article{MAN_1985__272_164004,
     author = {Christer Borell},
     title = {Greenian {Potentials} and {Concavity.}},
     journal = {Mathematische Annalen},
     pages = {155--160},
     publisher = {mathdoc},
     volume = {272},
     year = {1985},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MAN_1985__272_164004/}
}