On the simpleness of zeros of Stokes multipliers
  The aim of this paper is to discuss the simpleness of zeros of Stokes multipliers associated with the differential equation $-\Phi''(X) + W(X)\Phi(X) =0$, where $ W(X) = X^{m} +a_{1}X^{m-1}+... +a_{m}$ is a real monic polynomial. We show that, under a suitable hypothesis on the coefficients $a_k$, all the zeros of the Stokes multipliers are simple. 
D.T. Trinh