@article{ZNSL_1976_61_a4,
     author = {A. I. Il'inskii},
     title = {Arithmetic of {Levitan's} generalized characteristic functions},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {56--58},
     publisher = {mathdoc},
     volume = {61},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1976_61_a4/}
}