Geodesic
Complex WKB method for calculating the asymptotic behavior of phase integrals
Teoretičeskaâ i matematičeskaâ fizika, Tome 28 (1976) no. 2, pp. 281-287

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The complex variant of the WKB method developed in [1] when applied to an equation of Schrödinger type with constant coefficients gives one the possibility of calculating the asymptotic behavior of phase integrals with complex phase in the many-dimensional case. The resulting expressions are more convenient and apply in a more general situation than the expressions of the method of steepest descent. 
@article{TMF_1976_28_2_a13,
     author = {Le Vu An'},
     title = {Complex {WKB} method for calculating the asymptotic behavior of phase integrals},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {281--287},
     publisher = {mathdoc},
     volume = {28},
     number = {2},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1976_28_2_a13/}
}
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Le Vu An'. Complex WKB method for calculating the asymptotic behavior of phase integrals. Teoretičeskaâ i matematičeskaâ fizika, Tome 28 (1976) no. 2, pp. 281-287. http://geodesic.mathdoc.fr/item/TMF_1976_28_2_a13/