@article{SF_1990__40_1_135030,
     author = {M. Anderson},
     title = {Strongly differentiable monoids with smooth boundary.},
     journal = {Semigroup forum},
     pages = {363--378},
     publisher = {mathdoc},
     volume = {40},
     number = {1},
     year = {1990},
     zbl = {0699.22003},
     url = {http://geodesic.mathdoc.fr/item/SF_1990__40_1_135030/}
}