@article{SM_1995_186_6_a6,
     author = {V. A. Yurko},
     title = {On higher-order differential operators with a~regular singularity},
     journal = {Sbornik. Mathematics},
     pages = {901--928},
     publisher = {mathdoc},
     volume = {186},
     number = {6},
     year = {1995},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1995_186_6_a6/}
}