@article{1183492109,
author = {Koopman, B. O.},
title = {On analytic solutions of differential equations in the neighborhood of non-analytic singular points},
journal = {Bull. Amer. Math. Soc.},
volume = {33},
number = {6},
year = {1927},
pages = { 341-351},
language = {en},
url = {http://dml.mathdoc.fr/item/1183492109}
}
Koopman, B. O. On analytic solutions of differential equations in the neighborhood of non-analytic singular points. Bull. Amer. Math. Soc., Tome 33 (1927) no. 6, pp. 341-351. http://gdmltest.u-ga.fr/item/1183492109/