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@article{SF_1990__41_2_135042, author = {J.E. Mills}, title = {The inverse semigroup of partial symmetries of a convex polygon.}, journal = {Semigroup forum}, pages = {127--144}, publisher = {mathdoc}, volume = {41}, number = {2}, year = {1990}, zbl = {0704.20051}, url = {http://geodesic.mathdoc.fr/item/SF_1990__41_2_135042/} }
J.E. Mills. The inverse semigroup of partial symmetries of a convex polygon.. Semigroup forum, Tome 41 (1990) no. 2, pp. 127-144. http://geodesic.mathdoc.fr/item/SF_1990__41_2_135042/