@article{ZNSL_1970_19_a0,
     author = {N. K. Nikol'skii},
     title = {Preface},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {5},
     publisher = {mathdoc},
     volume = {19},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1970_19_a0/}
}