@article{ZNSL_1978_81_a0,
     author = {N. K. Nikol'skii and V. P. Khavin and S. V. Khrushchev},
     title = {Prefase},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {7--9},
     publisher = {mathdoc},
     volume = {81},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1978_81_a0/}
}