@article{01883681, title = {The combinatorial structure of trigonometry.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {2003}, year = {2003}, pages = {475-500}, doi = {10.1155/S0161171203106230}, zbl = {1017.51017}, language = {en}, url = {http://dml.mathdoc.fr/item/01883681} }
Antippa, Adel F. The combinatorial structure of trigonometry.. International Journal of Mathematics and Mathematical Sciences, Tome 2003 (2003) pp. 475-500. doi : 10.1155/S0161171203106230. http://gdmltest.u-ga.fr/item/01883681/