Geodesic
Asymptotic behavior of the fundamental solution of an elliptic equation with respect to a~complex parameter
Matematičeskie zametki, Tome 21 (1977) no. 3, pp. 377-390.

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Maslov's canonical operator method is used for constructing the asymptotic behavior with respect to a complex parameter of the fundamental solution of a secondorder elliptic equation with smooth finite coefficients. The asymptotic form is constructed on the assumption that all trajectories of the corresponding Hamiltonian system depart to infinity. The asymptotic form is used for investigating the analytic properties of the fundamental solution. 
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     author = {T. M. Gataullin},
     title = {Asymptotic behavior of the fundamental solution of an elliptic equation with respect to a~complex parameter},
     journal = {Matemati\v{c}eskie zametki},
     pages = {377--390},
     publisher = {mathdoc},
     volume = {21},
     number = {3},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1977_21_3_a9/}
}
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T. M. Gataullin. Asymptotic behavior of the fundamental solution of an elliptic equation with respect to a~complex parameter. Matematičeskie zametki, Tome 21 (1977) no. 3, pp. 377-390. http://geodesic.mathdoc.fr/item/MZM_1977_21_3_a9/