@article{AL_2018_57_4_a4,
     author = {A. N. Khisamiev},
     title = {Universal functions and unbounded branching trees},
     journal = {Algebra i logika},
     pages = {476--491},
     year = {2018},
     volume = {57},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_2018_57_4_a4/}
}