1. Williamson C.H.K. “Oblique and Parallel Modes of Vortex Shedding in the Wake of a Circular Cylinder at Low Reynolds Numbers”. J.Fluid Mech. 206, p579, 1989.
2. Eisenlohr H. and Eckelmann H. “Vortex Splitting and its Consequences in the Vortex Street Wake of Cylinders at Low Reynolds Number”. Phys. Fluid Al, p189, 1989
3. Hammache M. and Gharib M. “An Experimental Study of the Parallel and Oblique Vortex Shedding from Circular Cylinders”. J.Fluid Mech. 232, p567, 1991.
4. Gerrard J.H. The Mechanics of the Formation Region of Vortices behind Bluff Bodies”. J.Fluid Mech. 25, p401, 1966.
5. Huerre P. and Monkewitz A. “Local and Global Instabilities in Spatially Developing Flows”. Ann. Rev, Fluid Mech. 22, p473, 1990.