@article{GDZPPN002081016, title = {Die Eulersche Formel cos ... + i ...sin ... = ei...}, journal = {Elemente der Mathematik}, volume = {39}, year = {1984}, pages = {47-47}, zbl = {0535.30001}, url = {http://dml.mathdoc.fr/item/GDZPPN002081016} }
Laugwitz, D. Die Eulersche Formel cos ... + i ...sin ... = ei.... Elemente der Mathematik, Tome 39 (1984) p. 47. http://gdmltest.u-ga.fr/item/GDZPPN002081016/