ABOUT THE STABILITY OF THE LIBRATION POINTS OF A ROTATING TRIAXIAL ELLIPSOID IN A DEGENERATE CASE ArticleZhuravlev S.G.Celestial Mechanics. Том 8. 1973. С. 75-84
STABILITY OF THE LIBRATION POINTS OF A ROTATING TRIAXIAL ELLIPSOID ArticleZhuravlev S.G.Celestial Mechanics. Том 6. 1972. С. 255-267