@article{GDZPPN002480352, title = {A Comparison Method for Forced Oscillations.}, journal = {Monatshefte f\"ur Mathematik}, volume = {84}, year = {1977}, pages = {37-42}, zbl = {0344.34063}, url = {http://dml.mathdoc.fr/item/GDZPPN002480352} }
Onose, Hiroshi. A Comparison Method for Forced Oscillations.. Monatshefte für Mathematik, Tome 84 (1977) pp. 37-42. http://gdmltest.u-ga.fr/item/GDZPPN002480352/