@article{ZNSL_2002_294_a7,
     author = {N. D. Kan},
     title = {Martingale approach to the coupon collection problem},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {113--126},
     publisher = {mathdoc},
     volume = {294},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2002_294_a7/}
}