@article{02186432, title = {Periodic solutions of a high order equation with deviating arguments.}, journal = {Mathematica Pannonica}, volume = {15}, year = {2004}, pages = {259-264}, zbl = {1062.34074}, language = {en}, url = {http://dml.mathdoc.fr/item/02186432} }
Lin, Wen-Xian. Periodic solutions of a high order equation with deviating arguments.. Mathematica Pannonica, Tome 15 (2004) pp. 259-264. http://gdmltest.u-ga.fr/item/02186432/