@book{Bleistein_Handelsman_1986, address={New York}, title={Asymptotic expansions of integrals}, publisher={Dover Publications}, author={Bleistein, Norman and Handelsman, Richard A.}, year={1986} }
@book{de Bruijn_1981, address={New York}, edition={3rd ed}, title={Asymptotic methods in analysis}, publisher={Dover}, author={de Bruijn, M. G.}, year={1981} }
@book{Simmonds_Mann_1998, address={Mineola, N.Y.}, edition={2nd ed}, title={A first look at perturbation theory}, publisher={Dover Publications}, author={Simmonds, James G. and Mann, James E.}, year={1998} }
@book{Tricomi_2012, title={Integral Equations}, publisher={Dover Publications}, author={Tricomi, F G}, year={2012} }