APA citáció

Zhang Zhengqiu, Wang Z. C., & Yu J. S. (2000). Periodic solutions of neutral duffing equations.

Chicago Style (17th ed.) Citation

Zhang Zhengqiu, Wang Z. C., and Yu J. S. Periodic Solutions of Neutral Duffing Equations. 2000.

MLA idézés

Zhang Zhengqiu, et al. Periodic Solutions of Neutral Duffing Equations. 2000.