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@article{AM2_1993__46_2-3_137536, author = {J\"urg R\"atz and Karl Baron}, title = {Orthogonal and additivity modulo a subgroup.}, journal = {Aequationes mathematicae}, pages = {11--18}, publisher = {mathdoc}, volume = {46}, number = {2-3}, year = {1993}, zbl = {0789.39004}, url = {http://geodesic.mathdoc.fr/item/AM2_1993__46_2-3_137536/} }
Jürg Rätz; Karl Baron. Orthogonal and additivity modulo a subgroup.. Aequationes mathematicae, Tome 46 (1993) no. 2-3, pp. 11-18. http://geodesic.mathdoc.fr/item/AM2_1993__46_2-3_137536/