@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/