%0 Article %A Leeuwen Leonard C. A. van %D 1967 %G English %B Acta scientiarum mathematicarum %@ 0001-6969 %T On the endomorphism ring of direct sums of groups %U http://acta.bibl.u-szeged.hu/14133/1/math_028_fasc_001_002_021-029.pdf