TY - JOUR AU - Rätz, J. AU - Szabó, Gy. TI - On orthogonally additive mappings, IV. JO - Aequationes mathematicae PY - 1989 VL - 38 IS - 1 SP - 73 EP - 85 KW - orthogonality; additive; quadratic; orthogonally additive; 2-torsion- free; vector space; abelian group UR - http://eudml.org/doc/137317 ER -