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@article{SF_1993__46_1_135218, author = {A. de Luca and S. Varricchio}, title = {On a conjecture of {Brown.}}, journal = {Semigroup forum}, pages = {116--119}, publisher = {mathdoc}, volume = {46}, number = {1}, year = {1993}, zbl = {0791.20066}, url = {http://geodesic.mathdoc.fr/item/SF_1993__46_1_135218/} }
A. de Luca; S. Varricchio. On a conjecture of Brown.. Semigroup forum, Tome 46 (1993) no. 1, pp. 116-119. http://geodesic.mathdoc.fr/item/SF_1993__46_1_135218/