@article{TVP_1971_16_4_a5,
     author = {V. N. Sa\v{c}kov},
     title = {The distribution of the number of fixed points corresponding to elements of a~symmetric semigroup with the condition $\sigma^{h+1}=\sigma^h$, and the number of trees with the altitudes less or equal to~$h$},
     journal = {Teori\^a vero\^atnostej i ee primeneni\^a},
     pages = {676--687},
     publisher = {mathdoc},
     volume = {16},
     number = {4},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TVP_1971_16_4_a5/}
}