@article{1077490638, author = {Lehmer, D. H.}, title = {A cotangent analogue of continued fractions}, journal = {Duke Math. J.}, volume = {4}, number = {1}, year = {1938}, pages = { 323-340}, language = {en}, url = {http://dml.mathdoc.fr/item/1077490638} }
Lehmer, D. H. A cotangent analogue of continued fractions. Duke Math. J., Tome 4 (1938) no. 1, pp. 323-340. http://gdmltest.u-ga.fr/item/1077490638/