%0 Journal Article %A Havas, George %A Robertson, Edmund F. %T Irreducible cyclic presentations of the trivial group. %J Experimental mathematics %D 2003 %P 487-490 %V 12 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/EXMA_2003__12_4_51272/ %G en %F EXMA_2003__12_4_51272