@article{03908897,
title = {A note on periodic solutions of functional differential equations.},
journal = {International Journal of Mathematics and Mathematical Sciences},
volume = {8},
year = {1985},
pages = {413-415},
doi = {10.1155/S0161171285000448},
zbl = {0569.34057},
language = {en},
url = {http://dml.mathdoc.fr/item/03908897}
}
Chang, S.H. A note on periodic solutions of functional differential equations.. International Journal of Mathematics and Mathematical Sciences, Tome 8 (1985) pp. 413-415. doi : 10.1155/S0161171285000448. http://gdmltest.u-ga.fr/item/03908897/