@article{VCHGU_2009_11_a0,
     author = {A. A. Ershov},
     title = {Asymptotics of two-dimensional integrals depending singularity on a small parameter},
     journal = {Vestnik Chelyabinskogo Gosudarstvennogo Universiteta. Matematika, Mekhanika, Informatika},
     pages = {5--11},
     publisher = {mathdoc},
     number = {11},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VCHGU_2009_11_a0/}
}