@article{04105548,
title = {On Baica's trigonometric identity.},
journal = {International Journal of Mathematics and Mathematical Sciences},
volume = {12},
year = {1989},
pages = {119-122},
doi = {10.1155/S0161171289000165},
zbl = {0675.42002},
language = {en},
url = {http://dml.mathdoc.fr/item/04105548}
}
Gregorac, R.J. On Baica's trigonometric identity.. International Journal of Mathematics and Mathematical Sciences, Tome 12 (1989) pp. 119-122. doi : 10.1155/S0161171289000165. http://gdmltest.u-ga.fr/item/04105548/