1. P Bearman, Ann. Rev. Fluid Mech. 16, 195 (1984)
2. C H K Williamson, J. Fluid Mech. 328, 345 (1996)
3. M J Feigenbaum, L P Kandanoff and S J Shenker, Physica D5, 370 (1982)
4. S J Shenker, Physica D5, 405 (1982)
5. S Ostlund, D Rand, J Sethna and E Siggia, Physica D8, 303 (1983)