@article{TIMM_2009_15_3_a8,
     author = {A. M. Il'in and A. A. Ershov},
     title = {Asymptotics of two-dimensional integrals depending singularly on a~small parameter},
     journal = {Trudy Instituta matematiki i mehaniki},
     pages = {116--126},
     publisher = {mathdoc},
     volume = {15},
     number = {3},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TIMM_2009_15_3_a8/}
}