@article{ZNSL_1972_32_a9,
     author = {S. Yu. Maslov and E. D. Rusakov},
     title = {Probabilistic canonical systems},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {66--76},
     year = {1972},
     volume = {32},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1972_32_a9/}
}