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The saddle-point method. (Metod perevala). (Russian) Zbl 0463.41020
Moskva: ”Nauka”. 368 p. R. 1.70 (1977).

MSC:
41A60 Asymptotic approximations, asymptotic expansions (steepest descent, etc.)
41A55 Approximate quadratures
41A63 Multidimensional problems (should also be assigned at least one other classification number from Section 41-XX)
41-01 Introductory exposition (textbooks, tutorial papers, etc.) pertaining to approximations and expansions
42A38 Fourier and Fourier-Stieltjes transforms and other transforms of Fourier type
44A10 Laplace transform