@article{05829230,
title = {A note on periodic solutions of second order nonautonomous singular coupled systems.},
journal = {Mathematical Problems in Engineering},
volume = {2010},
year = {2010},
doi = {10.1155/2010/458918},
zbl = {1208.34051},
language = {en},
url = {http://dml.mathdoc.fr/item/05829230}
}
Cao, Zhongwei; Yuan, Chengjun; Jiang, Daqing; Wang, Xiaowei. A note on periodic solutions of second order nonautonomous singular coupled systems.. Mathematical Problems in Engineering, Tome 2010 (2010) . doi : 10.1155/2010/458918. http://gdmltest.u-ga.fr/item/05829230/