@article{ZNSL_1996_228_a6,
     author = {A. I. Vinogradov},
     title = {Comparison of spectra},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {67--76},
     year = {1996},
     volume = {228},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1996_228_a6/}
}