1. Asymptotic Expansions of Integrals;Bleistein,1975
2. Asymptotic Approximations for Probability Integral;Breitung,1994
3. Simple upper and lower bounds for the multivariate Laplace’s approximation;Inglot;J. Approx. Theory,2014
4. Foundations of Modern Probability;Kallenberg,1997
5. Semiclassical Analysis for Diffusions and Stochastic processes;Kolokoltsov,2000