@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/