Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{ELMA_1979__34_141233, author = {Ernst Ungeth\"um}, title = {Ponceletsche {Dreieckscharen.}}, journal = {Elemente der Mathematik}, pages = {109--119}, publisher = {mathdoc}, volume = {34}, year = {1979}, language = {de}, url = {http://geodesic.mathdoc.fr/item/ELMA_1979__34_141233/} }
Ernst Ungethüm. Ponceletsche Dreieckscharen.. Elemente der Mathematik, Tome 34 (1979), pp. 109-119. http://geodesic.mathdoc.fr/item/ELMA_1979__34_141233/