ABSTRACT
Melander, M. V., Zabusky, N. J. & McWilliams, J. C. "Symmetric vortex merger in two dimensions: causes and conditions." J. Fluid Mech. 195,303-340 (1988).
Prandtl, L. "Meteorologische Anwendungen der Stromungslehre." Beitr. Physik fro Atmos. 19, 188-202 (1932).
