Zelati, V. C., Shujie, L., & Shaoping, W. (1991). Periodic solutions of a class of singular nonautonomous second order sustems in a potential well. Trieste: International Centre for Theoretical Physics.
Chicago Style CitationZelati, V. Coti, Li Shujie, and Wu Shaoping. Periodic Solutions of a Class of Singular Nonautonomous Second Order Sustems in a Potential Well. Trieste: International Centre for Theoretical Physics, 1991.
MLA CitationZelati, V. Coti, Li Shujie, and Wu Shaoping. Periodic Solutions of a Class of Singular Nonautonomous Second Order Sustems in a Potential Well. Trieste: International Centre for Theoretical Physics, 1991.
Warning: These citations may not always be 100% accurate.