The Modified Restricted Three Body Problems
  The restricted three body problem is well-known and very important for dynamics of binary, multiple stars and also planetary systems. We extend the classical version of this problem to the situation that there are some external forces from the belt. We find that both the equilibrium points and solution curves become quite different from the classical case. We also determine the values of Lyapunov Exponent for some important orbits. 
Ing-Guey Jiang (1) and Li-Chin Yeh (2) ((1)National Tsing-Hua   University, Taiwan, (2)National Hsinchu University of Educat...