Geodesic
The class of mappings of $P_2^n$ into itself which are realizable by formulas
Učënye zapiski Kazanskogo universiteta. Seriâ Fiziko-matematičeskie nauki, Probabilistic methods and cybernetics. IV, Tome 125 (1965) no. 6, pp. 34-44 
Yu. V. Golunkov. The class of mappings of $P_2^n$ into itself which are realizable by formulas. Učënye zapiski Kazanskogo universiteta. Seriâ Fiziko-matematičeskie nauki, Probabilistic methods and cybernetics. IV, Tome 125 (1965) no. 6, pp. 34-44. http://geodesic.mathdoc.fr/item/UZKU_1965_125_6_a2/
@article{UZKU_1965_125_6_a2,
     author = {Yu. V. Golunkov},
     title = {The class of mappings of $P_2^n$ into itself which are realizable by formulas},
     journal = {U\v{c}\"enye zapiski Kazanskogo universiteta. Seri\^a Fiziko-matemati\v{c}eskie nauki},
     pages = {34--44},
     year = {1965},
     volume = {125},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZKU_1965_125_6_a2/}
}
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