@article{ZNSL_1999_260_a6,
     author = {M. I. Gordin},
     title = {Double extensions of dynamical systems and a construction of mixing {filtrations.~II.} {Quasihyperbolic}},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {103--118},
     year = {1999},
     volume = {260},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1999_260_a6/}
}