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@article{SF_1974__9_134073, author = {M.S. Putcha}, title = {Viewing results on ...-indecomposable semigroups as solutions to mathematical puzzles.}, journal = {Semigroup forum}, pages = {181--183}, publisher = {mathdoc}, volume = {9}, year = {1974}, zbl = {0292.20059}, url = {http://geodesic.mathdoc.fr/item/SF_1974__9_134073/} }
M.S. Putcha. Viewing results on ...-indecomposable semigroups as solutions to mathematical puzzles.. Semigroup forum, Tome 9 (1974), pp. 181-183. http://geodesic.mathdoc.fr/item/SF_1974__9_134073/