%0 Journal Article %A Carlo Viola %T On the diophantine equations $\prod_{0}^k x_i - \sum_{0}^k x_i = n and \sum_{0}^k 1/x_i = a/n$ %J Acta Arithmetica %D 1972 %P 339-352 %V 22 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/aa-22-3-339-352/ %R 10.4064/aa-22-3-339-352 %G en %F 10_4064_aa_22_3_339_352