1. Infinitely Many Periodic Solutions of Duffing Equations with Singularities via Time Map. (16th April 2014) Authors: Ma, Tiantian; Wang, Zaihong Other Names: Peng Shuangjie Academic Editor. Journal: Abstract and applied analysis Issue: Volume 2014(2014) Page Start: Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗