Z. Niedzielska, NONLINEAR STABILITY OF THE LIBRATION POINTS IN THE PHOTOGRAVITATIONALRESTRICTED 3 BODY PROBLEM, Celestial mechanics & dynamical astronomy, 58(3), 1994, pp. 203-213
The stability of the triangular libration points in the case when the
first and the second order resonances appear was investigated. It was
proved that the first order resonances do not cause instability. The s
econd order resonances may lead to instability. Domains of the instabi
lity in the two-dimensional parameter space were determined.