@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/