%0 Journal Article %A K. Kubota %T On a conjecture of Morgan Ward, I %J Acta Arithmetica %D 1977 %P 11-28 %V 33 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/aa-33-1-11-28/ %R 10.4064/aa-33-1-11-28 %G en %F 10_4064_aa_33_1_11_28