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@article{ELMA_1969__24_140939, author = {Heiko Harborth}, title = {Diagonalen im regul\"aren {n-Eck.}}, journal = {Elemente der Mathematik}, pages = {104--109}, publisher = {mathdoc}, volume = {24}, year = {1969}, zbl = {0177.48702}, url = {http://geodesic.mathdoc.fr/item/ELMA_1969__24_140939/} }
Heiko Harborth. Diagonalen im regulären n-Eck.. Elemente der Mathematik, Tome 24 (1969), pp. 104-109. http://geodesic.mathdoc.fr/item/ELMA_1969__24_140939/