@article{GDZPPN001259067, title = {Differentiable monoids with smooth boundary.}, journal = {Semigroup forum}, volume = {36}, year = {1987}, pages = {211-222}, zbl = {0627.22002}, url = {http://dml.mathdoc.fr/item/GDZPPN001259067} }
Holmes, J.P. Differentiable monoids with smooth boundary.. Semigroup forum, Tome 36 (1987) pp. 211-222. http://gdmltest.u-ga.fr/item/GDZPPN001259067/