@article{IM2_1983_21_2_a10,
     author = {S. A. Lomov and A. S. Yudina},
     title = {The structure of a~fundamental system of solutions of a~singularly perturbed equation with a~regular singular point},
     journal = {Izvestiya. Mathematics },
     pages = {415--424},
     publisher = {mathdoc},
     volume = {21},
     number = {2},
     year = {1983},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1983_21_2_a10/}
}