@article{1183496854,
author = {Ritt, J. F.},
title = {Integral functions obtained by compounding polynomials},
journal = {Bull. Amer. Math. Soc.},
volume = {39},
number = {12},
year = {1933},
pages = { 627-632},
language = {en},
url = {http://dml.mathdoc.fr/item/1183496854}
}
Ritt, J. F. Integral functions obtained by compounding polynomials. Bull. Amer. Math. Soc., Tome 39 (1933) no. 12, pp. 627-632. http://gdmltest.u-ga.fr/item/1183496854/