@article{UZKU_2009_151_2_a6,
     author = {A. B. Dainiak},
     title = {On the {Number} of {Independent} {Sets} in {Perfect} $q$-ary {Trees}},
     journal = {U\v{c}\"enye zapiski Kazanskogo universiteta. Seri\^a Fiziko-matemati\v{c}eskie nauki},
     pages = {59--64},
     year = {2009},
     volume = {151},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZKU_2009_151_2_a6/}
}