@misc{ZNSL_1972_27_a0,
     title = {Preface},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {3--6},
     publisher = {mathdoc},
     volume = {27},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1972_27_a0/}
}