1. P. Appell,Equilibrium Figures of a Rotating Homogeneous Liquid [Russian translation from French], Ob’ed. Nauchno-Tekh. Izd., Moscow (1936).
2. N. I. Idel’son,Potential Theory [in Russian], Ob’ed. Nauchno-Tekh. Izd., Leningrad, Moscow (1936).
3. M. F. Subbotin,A Course in Celestial Mechanics [in Russian], Vol. 3, Gostekhizdat, Leningrad, Moscow (1949).
4. L. Likhtenshtein,Figures of Equilibrium of a Rotating Fluid [in Russian], Nauka, Moscow (1965).
5. J.-L. Tassoul,Theory of Rotating Stars, Princeton Univ. Press, Princeton NJ (1978).