@article{AL_1964_3_5_a4,
     author = {Jan Mycielski},
     title = {The definition of arithmetic operations in the {Ackermann} model},
     journal = {Algebra i logika},
     pages = {64--65},
     publisher = {mathdoc},
     volume = {3},
     number = {5},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1964_3_5_a4/}
}