@article{00650807, title = {A new class of infinite products, and Euler's totient.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {17}, year = {1994}, pages = {417-422}, doi = {10.1155/S0161171294000591}, zbl = {0809.05010}, language = {en}, url = {http://dml.mathdoc.fr/item/00650807} }
Campbell, Geoffrey B. A new class of infinite products, and Euler's totient.. International Journal of Mathematics and Mathematical Sciences, Tome 17 (1994) pp. 417-422. doi : 10.1155/S0161171294000591. http://gdmltest.u-ga.fr/item/00650807/