Note on degree axial coordinates
Abstract: Recently the author introduced  a symmetrical system of distance coordinates for studying the planar motion of a three-body system of point masses in its internal degrees of freedom, and applied them to the small vibration problem. Subsequently he applied them  to the gravitational three-body problem. The purpose of this note is to give a geometrical identification of the auxiliary angles , and , related to the system, and to prove the identity which they satisfy.
-  W. E. Bleick, New coordinates for three-body problems, Proceedings of the International Symposium on Quantum Chemistry, Theory of Condensed Matter, and Propagator Methods in the Quantum Theory of Matter (Flagler Beach, Fla., 1982), 1982, pp. 241–245. MR 698245, https://doi.org/10.1002/qua.560220825
-  Bleick, W. E., Gravitational three-body problem in 120 deg axial coordinates, Journal of Guidance, Control and Dynamics, 6 124-128 (1983)
- Bleick, W. E., New coordinates for three-body problems, International Journal of Quantum Chemistry, Vol. 22, Quantum Chemistry Symposium No. 16, 241-245, 1982. MR 698245
- Bleick, W. E., Gravitational three-body problem in 120 deg axial coordinates, Journal of Guidance, Control and Dynamics, 6 124-128 (1983)