A counterexample in the cohomology of monoids.
Semigroup forum, Tome 4 (1972), pp. 93-94.

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     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/}
}
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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/