APA (7th ed.) Citation

Du, Z. On the critical periods of Liénard systems with cubic restoring forces. Wiley.

Chicago Style (17th ed.) Citation

Du, Zhengdong. On the Critical Periods of Liénard Systems with Cubic Restoring Forces. Wiley.

MLA (9th ed.) Citation

Du, Zhengdong. On the Critical Periods of Liénard Systems with Cubic Restoring Forces. Wiley.

Warning: These citations may not always be 100% accurate.