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@article{SF_1972__4_133883, author = {W.R. Nico}, title = {A counterexample in the cohomology of monoids.}, journal = {Semigroup forum}, pages = {93--94}, publisher = {mathdoc}, volume = {4}, year = {1972}, zbl = {0254.18011}, url = {http://geodesic.mathdoc.fr/item/SF_1972__4_133883/} }
W.R. Nico. A counterexample in the cohomology of monoids.. Semigroup forum, Tome 4 (1972), pp. 93-94. http://geodesic.mathdoc.fr/item/SF_1972__4_133883/