1. Arnol'd, V. I., 1965: Condition for nonlinear stability of stationary plane curvilinear flows of an ideal fluid. Dokl. Akad. Nauk. SSSR., 165, 975–978. (English Transi.: Soviet Math., 6, 773–777).
2. Arnol'd, V. I., 1969: On a prior estimate in the theory of hydrodynamic stability. Amer. Math. Soc. Transi, 19, 267–269.
3. Cushman-Roisin, B., 1986: Frontal geostrophic dynamics. J. Phys. Oceanogr., 16, 132–143.
4. Cushman-Roisin, B., G. G. Sutyrin, and B. Tang, 1992: Two-layer geostrophic dynamics. Part I: Governing equa- tions. J. Phys. Oceanogr., 22, 117–127.
5. Griffiths, R. W., P. D. Killworth, and M. E. Stern, 1982: Ageostrophic instability of ocean currents. J. Fluid Mech., 117, 343–377.