@article{CMH_1977__52_139697,
     author = {Larry Q. Eifler},
     title = {Semi-continuity of the face-function for a convex set.},
     journal = {Commentarii mathematici Helvetici},
     pages = {325--328},
     publisher = {mathdoc},
     volume = {52},
     year = {1977},
     zbl = {0357.46001},
     url = {http://geodesic.mathdoc.fr/item/CMH_1977__52_139697/}
}