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@article{SF_1987__36_134897, author = {J.P. Holmes}, title = {Differentiable monoids with smooth boundary.}, journal = {Semigroup forum}, pages = {211--222}, publisher = {mathdoc}, volume = {36}, year = {1987}, zbl = {0627.22002}, url = {http://geodesic.mathdoc.fr/item/SF_1987__36_134897/} }
J.P. Holmes. Differentiable monoids with smooth boundary.. Semigroup forum, Tome 36 (1987), pp. 211-222. http://geodesic.mathdoc.fr/item/SF_1987__36_134897/