@article{GDZPPN002270900,
title = {Transcendental transcendency of certain functions of Poincar\'e},
journal = {Mathematische Annalen},
volume = {95},
year = {1926},
pages = {671-682},
zbl = {52.0321.04},
url = {http://dml.mathdoc.fr/item/GDZPPN002270900}
}
Ritt, J.F. Transcendental transcendency of certain functions of Poincaré. Mathematische Annalen, Tome 95 (1926) pp. 671-682. http://gdmltest.u-ga.fr/item/GDZPPN002270900/