%0 Journal Article %A R. Goldstein %A J. Teymouri %T Adjan's theorem and conjugacy in semigroups. %J Semigroup forum %D 1993 %P 299-304 %V 47 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/SF_1993__47_2_135280/ %F SF_1993__47_2_135280