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@article{SF_1972__4_133914, author = {K.K.H. Butler and R. Brandon and D.W. Hardy and G. Markowsky}, title = {Cardinalities of {D-classes} in {Bn.}}, journal = {Semigroup forum}, pages = {341--344}, publisher = {mathdoc}, volume = {4}, year = {1972}, zbl = {0253.05006}, url = {http://geodesic.mathdoc.fr/item/SF_1972__4_133914/} }
K.K.H. Butler; R. Brandon; D.W. Hardy; G. Markowsky. Cardinalities of D-classes in Bn.. Semigroup forum, Tome 4 (1972), pp. 341-344. http://geodesic.mathdoc.fr/item/SF_1972__4_133914/