@article{IM2_2009_73_3_a7,
     author = {A. S. Yudina},
     title = {The singularly perturbed {Bessel} equation in complex domains},
     journal = {Izvestiya. Mathematics },
     pages = {627--653},
     publisher = {mathdoc},
     volume = {73},
     number = {3},
     year = {2009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2009_73_3_a7/}
}