@article{TVP_1967_12_3_a14,
     author = {N. I. Portenko},
     title = {Integral equations and some limit theorems for additive functionals of {Markov} processes},
     journal = {Teori\^a vero\^atnostej i ee primeneni\^a},
     pages = {551--559},
     publisher = {mathdoc},
     volume = {12},
     number = {3},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TVP_1967_12_3_a14/}
}