@article{03798121,
title = {On the Ritt order of a certain class of functions.},
journal = {International Journal of Mathematics and Mathematical Sciences},
volume = {6},
year = {1983},
pages = {181-187},
doi = {10.1155/S0161171283000162},
zbl = {0506.30017},
language = {en},
url = {http://dml.mathdoc.fr/item/03798121}
}
Parvatham, R.; Thangamani, J. On the Ritt order of a certain class of functions.. International Journal of Mathematics and Mathematical Sciences, Tome 6 (1983) pp. 181-187. doi : 10.1155/S0161171283000162. http://gdmltest.u-ga.fr/item/03798121/