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@article{MAN_1968__178_161731, author = {J. BLATTER and P.D. MORRIS and D.E. WULBERT}, title = {Continuity of the {Set-valued} {Metric} {Projection.}}, journal = {Mathematische Annalen}, pages = {12--24}, publisher = {mathdoc}, volume = {178}, year = {1968}, zbl = {0189.42904}, url = {http://geodesic.mathdoc.fr/item/MAN_1968__178_161731/} }
J. BLATTER; P.D. MORRIS; D.E. WULBERT. Continuity of the Set-valued Metric Projection.. Mathematische Annalen, Tome 178 (1968), pp. 12-24. http://geodesic.mathdoc.fr/item/MAN_1968__178_161731/