1. H. Poincaré, Figures d’équilibre d’une masse fluide (Gauthier-Villars, Paris, 1900; RKhD, Moscow, 2000).
2. P. Appell, Figures d’équilibre d’une masse liquide homogène en rotation (Gauthier-Villars, Paris, 1932; ONTI, Leningrad, 1936).
3. L. N. Sretensky, Theory of Newtonian Potential (GITTL, Moscow, 1946) [in Russian].
4. E. W. Hobson, The Theory of Spherical and Ellipsoidal Harmonics (Cambridge Univ. Press, Cambridge, 1931; Inostrannaya Literatura, Moscow, 1952).
5. G. N. Duboshin, Theory of Attraction (Fizmatlit, Moscow, 1961) [in Russian].