@article{1183498781,
author = {Carmichael, R. D.},
title = {Linear differential equations of infinite order},
journal = {Bull. Amer. Math. Soc.},
volume = {42},
number = {12},
year = {1936},
pages = { 193-218},
language = {en},
url = {http://dml.mathdoc.fr/item/1183498781}
}
Carmichael, R. D. Linear differential equations of infinite order. Bull. Amer. Math. Soc., Tome 42 (1936) no. 12, pp. 193-218. http://gdmltest.u-ga.fr/item/1183498781/