@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/