%0 Journal Article %A G. ÄŒupona %A N. Celakoski %A B. Janeva %T Free groupoids with axioms of the form x^(m+1)y = xy and/or xy^(n+l) = xy %J Novi Sad Journal of Mathematics %D 1999 %P 131-147 %V 29 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/NSJOM_1999_29_2a_8/ %F NSJOM_1999_29_2a_8