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

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