6Zdravkovieh J W. Different Modes of Vortex Shedding: An Overview[J]. Journal of Fluids and Structures, 1996 (10): 427 -427.
7Williamson C H K. Advances in Our Understanding of Vortex Dynamics in Bluff Body Wakes [ J]. Journal of Wind Engineering and Industrial Aerodynamics, 1997 (7): 69-71.