1. Central configurations of four bodies with one inferior mass;Arenstorff;Celestial Mech.,1982
2. Ideals, Varieties and Algorithms, an Introduction to Computational Algebraic Geometry and Commutative Algebra;Cox,1992
3. Finiteness and bifurcations of some symmetrical classes of central configurations;Leandro;Arch. Ration. Mech. Anal.,2003
4. J.R. Gannaway, Determination of all central configurations in the planar four-body problem with one inferior mass, thesis, Vanderbilt University, TN, 1981
5. Celestial Mechanics I;Hagihara,1970