@article{01538432, title = {On the Ritt order and type of a certain class of functions defined by }, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {22}, year = {1999}, pages = {445-458}, doi = {10.1155/S0161171299224453}, zbl = {0963.30003}, language = {en}, url = {http://dml.mathdoc.fr/item/01538432} }
Berland, Marcel. On the Ritt order and type of a certain class of functions defined by . International Journal of Mathematics and Mathematical Sciences, Tome 22 (1999) pp. 445-458. doi : 10.1155/S0161171299224453. http://gdmltest.u-ga.fr/item/01538432/