Bounds for Integral j -Invariants and Cartan Structures on Elliptic   Curves
  We bound the j -invariant of integral points on a modular curve in terms of the congruence group defining the curve. We apply this to prove that the modular curve Xsplit (p3) has no non-trivial rational point if p is a sufficiently large prime number. Assuming the GRH, one can replace p3 by p2 . 
Yuri Bilu (IMB), Pierre Parent (IMB)