@article{ZNSL_1997_244_a3,
     author = {M. I. Gordin},
     title = {Double extensions of dynamical systems and a construction of mixing filtrations},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {61--72},
     publisher = {mathdoc},
     volume = {244},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1997_244_a3/}
}