@article{UZKU_2013_155_4_a1,
     author = {V. V. Bochkarev and E. Yu. Lerner and A. V. Shevlyakova},
     title = {Verification of the {Heaps} law using the {Google} {Books} {Ngram} database},
     journal = {U\v{c}\"enye zapiski Kazanskogo universiteta. Seri\^a Fiziko-matemati\v{c}eskie nauki},
     pages = {16--23},
     publisher = {mathdoc},
     volume = {155},
     number = {4},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZKU_2013_155_4_a1/}
}