@article{MZ_1967__101_170827,
     author = {Rolf Schneider},
     title = {Zu einem {Problem} von {Shephard} \"uber die {Projektionen} konvexer {K\"orper.}},
     journal = {Mathematische Zeitschrift},
     pages = {71--82},
     year = {1967},
     volume = {101},
     zbl = {0173.24703},
     url = {http://geodesic.mathdoc.fr/item/MZ_1967__101_170827/}
}