@article{GDZPPN002042258, title = {Pythagorean orthogonality and additive mappings.}, journal = {Aequationes mathematicae}, volume = {53}, year = {1997}, pages = {108-126}, zbl = {0901.39008}, url = {http://dml.mathdoc.fr/item/GDZPPN002042258} }
Szabó, György. Pythagorean orthogonality and additive mappings.. Aequationes mathematicae, Tome 53 (1997) pp. 108-126. http://gdmltest.u-ga.fr/item/GDZPPN002042258/