%0 Journal Article %A Ronald Evans %T Nonexistence of twentieth power residue difference sets %J Acta Arithmetica %D 1999 %P 397-402 %V 89 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/aa-89-4-397-402/ %R 10.4064/aa-89-4-397-402 %G en %F 10_4064_aa_89_4_397_402