%0 Journal Article %A Constantin N. Beli %T Two conjectures by Zhi-Hong Sun %J Acta Arithmetica %D 2009 %P 99-131 %V 137 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/aa137-2-1/ %R 10.4064/aa137-2-1 %G en %F 10_4064_aa137_2_1