1. G. R. Hall, Central configurations of the 1+𝑁 body problem, preprint.
2. K. Meyer and D. Schmidt, Bifurcation of relative equilibria in the four and five body problem, preprint.
3. Relative equilibria of the four-body problem;Moeckel, Richard;Ergodic Theory Dynam. Systems,1985
4. On the role and the properties of 𝑛-body central configurations;Saari, Donald G.;Celestial Mech.,1980
5. D. Schmidt, Central configurations in 𝐑² and 𝐑³, preprint.