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@article{SF_1990__41_2_135032, author = {J. N\'eraud}, title = {On the deficit of a set of words.}, journal = {Semigroup forum}, pages = {1--22}, publisher = {mathdoc}, volume = {41}, number = {2}, year = {1990}, zbl = {0679.20049}, url = {http://geodesic.mathdoc.fr/item/SF_1990__41_2_135032/} }
J. Néraud. On the deficit of a set of words.. Semigroup forum, Tome 41 (1990) no. 2, pp. 1-22. http://geodesic.mathdoc.fr/item/SF_1990__41_2_135032/