@article{MZM_1998_64_1_a6,
     author = {G. I. Ivchenko},
     title = {How many samples does it take to see all the balls in an urn?},
     journal = {Matemati\v{c}eskie zametki},
     pages = {58--63},
     publisher = {mathdoc},
     volume = {64},
     number = {1},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1998_64_1_a6/}
}