@article{MT_1982_1_a12,
     author = {G. P. Karev},
     title = {On the quadratic variation of random sequences},
     journal = {Matemati\v{c}eskie trudy},
     pages = {156--159},
     publisher = {mathdoc},
     volume = {1},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MT_1982_1_a12/}
}