@article{00978043,
title = {On periodic solutions of second order functional differential equations.},
journal = {Memoirs on Differential Equations and Mathematical Physics},
volume = {6},
year = {1995},
pages = {125-126},
zbl = {0866.34054},
language = {en},
url = {http://dml.mathdoc.fr/item/00978043}
}
Lomtatidze, A.; Mukhigulashvili, S. On periodic solutions of second order functional differential equations.. Memoirs on Differential Equations and Mathematical Physics, Tome 6 (1995) pp. 125-126. http://gdmltest.u-ga.fr/item/00978043/