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@article{AM2_1989__37_2-3_137308, author = {Walter Benz and Claudi Alsina}, title = {Proportion functions in three dimensions.}, journal = {Aequationes mathematicae}, pages = {293--305}, publisher = {mathdoc}, volume = {37}, number = {2-3}, year = {1989}, zbl = {0674.39009}, url = {http://geodesic.mathdoc.fr/item/AM2_1989__37_2-3_137308/} }
Walter Benz; Claudi Alsina. Proportion functions in three dimensions.. Aequationes mathematicae, Tome 37 (1989) no. 2-3, pp. 293-305. http://geodesic.mathdoc.fr/item/AM2_1989__37_2-3_137308/