1. L. Euler, “De motu rectilineo trium corporum se mutuo attrahentium,” Nov. Comm. Petrop. 11, 144–151 (1765).
2. T. Levi-Civita, “Traettorie singolari ed urbi nel problema ristretto dei tre corpi,” Ann. Mat. Pura Appl. 9, 1–32 (1904).
3. T. Levi-Civita, “Sur la regularization du probleme des trois corps,” Acta Math. 42, 99–144 (1920). https://doi.org/10.1007/BF02418577
4. T. Levi-Civita, “Sur la resolution qualitative du probleme restreint des trois corps,” Opere Mathematiche, No. 2, 411–417 (1956).
5. P. Kustaanheimo, “Spinor regularization of the Kepler motion,” Ann. Univ. Turku 73, 3–7 (1964).