1. Birkhoff, G. D. (1913). Proof of Poincare’s geometric theorem. Transactions on American Mathematical Society, 14, 14–22.
2. Birkhoff, G. D. (1927). Dynamical Systems. New York: American Mathematical Society.
3. Blevins, R. D. (1974). Flow induced vibration, Ph.D. Thesis. California Institute of Technology, Pasadena, California.
4. Blevins, R. D. (1977). Flow-induced vibration. New York, N.Y.: Van Nostrand Reinhold Co.
5. Blevins, R. D., & Iwan, W. D. (1974). The galloping response of a two-degree-of-freedom system. ASME Transactions Journal of Applied Mechanics, 96(3), 1113–1118.