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@article{MAN_1976__223_162886, author = {Richard C. O'Brien}, title = {On the {Openness} of the {Barycentre} {Map.}}, journal = {Mathematische Annalen}, pages = {207--212}, publisher = {mathdoc}, volume = {223}, year = {1976}, zbl = {0321.46004}, url = {http://geodesic.mathdoc.fr/item/MAN_1976__223_162886/} }
Richard C. O'Brien. On the Openness of the Barycentre Map.. Mathematische Annalen, Tome 223 (1976), pp. 207-212. http://geodesic.mathdoc.fr/item/MAN_1976__223_162886/