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@article{AM2_1989__38_1_137319, author = {S.-L. Eriksson-Bique and H. Leutwiler}, title = {A generalization of parallel addition.}, journal = {Aequationes mathematicae}, pages = {99--110}, publisher = {mathdoc}, volume = {38}, number = {1}, year = {1989}, zbl = {0682.47024}, url = {http://geodesic.mathdoc.fr/item/AM2_1989__38_1_137319/} }
S.-L. Eriksson-Bique; H. Leutwiler. A generalization of parallel addition.. Aequationes mathematicae, Tome 38 (1989) no. 1, pp. 99-110. http://geodesic.mathdoc.fr/item/AM2_1989__38_1_137319/