@article{1077476234, author = {Ramler, O. J.}, title = {A poristic system of triangles}, journal = {Duke Math. J.}, volume = {17}, number = {1}, year = {1950}, pages = { 443-451}, language = {en}, url = {http://dml.mathdoc.fr/item/1077476234} }
Ramler, O. J. A poristic system of triangles. Duke Math. J., Tome 17 (1950) no. 1, pp. 443-451. http://gdmltest.u-ga.fr/item/1077476234/