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@article{MZ_1960__74_169872, author = {Erich Kamke}, title = {Zur {Theorie} der elementaren {Mittel.}}, journal = {Mathematische Zeitschrift}, pages = {91--98}, publisher = {mathdoc}, volume = {74}, year = {1960}, zbl = {0095.03801}, url = {http://geodesic.mathdoc.fr/item/MZ_1960__74_169872/} }
Erich Kamke. Zur Theorie der elementaren Mittel.. Mathematische Zeitschrift, Tome 74 (1960), pp. 91-98. http://geodesic.mathdoc.fr/item/MZ_1960__74_169872/