@article{1183485380,
author = {Franklin, P.},
title = {A qualitative definition of the trigonometric and hyperbolic functions},
journal = {Bull. Amer. Math. Soc.},
volume = {29},
number = {10},
year = {1923},
pages = { 56-64},
language = {en},
url = {http://dml.mathdoc.fr/item/1183485380}
}
Franklin, P. A qualitative definition of the trigonometric and hyperbolic functions. Bull. Amer. Math. Soc., Tome 29 (1923) no. 10, pp. 56-64. http://gdmltest.u-ga.fr/item/1183485380/