@article{TRSPY_1968_104_a4,
     author = {N. M. Mitrofanova},
     title = {Families of transition densities in {Markov} chains which allow non-trivial sufficient statistics},
     journal = {Informatics and Automation},
     pages = {181--188},
     publisher = {mathdoc},
     volume = {104},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1968_104_a4/}
}