@article{SM_1999_190_9_a2,
     author = {I. K. Lifanov and L. N. Poltavskii},
     title = {Spaces of fractional quotients, discrete operators, and their {applications.~I}},
     journal = {Sbornik. Mathematics},
     pages = {1267--1323},
     publisher = {mathdoc},
     volume = {190},
     number = {9},
     year = {1999},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1999_190_9_a2/}
}