@article{MZM_1987_42_6_a12,
     author = {V. I. Afanasyev},
     title = {Mean value of a function of a random walk up to the time of the first passage to the semiaxis},
     journal = {Matemati\v{c}eskie zametki},
     pages = {895--901},
     publisher = {mathdoc},
     volume = {42},
     number = {6},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1987_42_6_a12/}
}