@article{MZM_1977_21_5_a13,
     author = {V. A. Vatutin},
     title = {A~conditional limit theorem for a~critical {Branching} process with immigration},
     journal = {Matemati\v{c}eskie zametki},
     pages = {727--736},
     publisher = {mathdoc},
     volume = {21},
     number = {5},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1977_21_5_a13/}
}