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2. M. S. Longuet-Higgins, “A class of exact, time-dependent, free-surface flows,” J. Fluid Mech., 55, 529–543 (1972).
3. V. I. Nalimov and V. V. Pukhnachev, Unsteady Motion of an Ideal Fluid with a Free Boundary [in Russian], Novosibirsk State University, Novosibirsk (1975).
4. S. Chandrasekhar, Ellipsoidal Figures of Equilibrium, Yale Univ. Press, New Haven–London (1969).
5. L. V. Ovsiannikov, “One class of the non-stationary motion with a free boundary [in Russian],” in: Dynamics of Continuous Media (Collected Scientific Papers), Lavrentyev Institute of Hydrodynamics, Novosibirsk (1972), pp. 124–130.