@misc{ZNSL_1974_40_a0,
     title = {From the authors},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {3},
     publisher = {mathdoc},
     volume = {40},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1974_40_a0/}
}