@article{1029001104,
author = {Nussbaum, Roger D.},
title = {Periodic solutions of analytic functional differential equations are analytic.},
journal = {Michigan Math. J.},
volume = {20},
number = {1},
year = {1973},
pages = { 249-255},
language = {en},
url = {http://dml.mathdoc.fr/item/1029001104}
}
Nussbaum, Roger D. Periodic solutions of analytic functional differential equations are analytic.. Michigan Math. J., Tome 20 (1973) no. 1, pp. 249-255. http://gdmltest.u-ga.fr/item/1029001104/