1. M. I. Gurevich, The Theory of Jets in an Ideal Fluid [in Russian], Nauka, Moscow (1979); English transl. prev. ed., Pergamon, Oxford (1966).
2. L. M. Milne-Thomson, Theoretical Hydrodynamics, Dover, New York (1968).
3. H. Villat, “Sur I’´ecoulement des fluides pesants,” Ann. Sci. ´ Ecole Norm. Sup. (3), 32, 177–214 (1915).
4. A. R. Richardson, “Stationary waves in water,” Phil. Mag. (6), 40, 97–110 (1920).
5. L. V. Ovsyannikov, “General equations and examples [in Russian],” in: The Free Boundary Problem of Unsteady Motion of a Fluid, Nauka, Novosibirsk (1967), pp. 5–75.