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In this paper we classify the central configurations of the circularrestricted 4-body problem with three primaries at the collinear configurationof the 3-body problem and an infinitesimal mass. The case where the threeprimaries have the same mass, with one of the bodies staying motionless at thecenter of mass, was considered in 2021 by Llibre. The video\url{https://youtu.be/PWFtqxd4RUA} goes over some of the results in this paper.

Lagrange points of Euler's solutions of the 3-body problem