@article{1077477042, author = {Court, N. A.}, title = {Isogonal points for a tetrahedron}, journal = {Duke Math. J.}, volume = {19}, number = {1}, year = {1952}, pages = { 71-74}, language = {en}, url = {http://dml.mathdoc.fr/item/1077477042} }
Court, N. A. Isogonal points for a tetrahedron. Duke Math. J., Tome 19 (1952) no. 1, pp. 71-74. http://gdmltest.u-ga.fr/item/1077477042/