@article{MZ_1978__160_172681,
     author = {Achim Clausing},
     title = {Retractions and {Open} {Mappings} between {Convex} {Sets.}},
     journal = {Mathematische Zeitschrift},
     pages = {263--274},
     publisher = {mathdoc},
     volume = {160},
     year = {1978},
     zbl = {0363.46002},
     url = {http://geodesic.mathdoc.fr/item/MZ_1978__160_172681/}
}