TY - JOUR TI - Sums of normal endomorphisms T3 - Acta scientiarum mathematicarum AU - Bruck Richard Hubert PY - 1961 LA - English SN - 0001-6969 UR - http://acta.bibl.u-szeged.hu/13915/1/math_022_fasc_001_002_006-030.pdf ER -