@article{DVMG_2021_21_2_a0,
     author = {M. O. Avdeeva},
     title = {Periodic ultradiscrete transformations of the plane with periods of 5, 7, 8, 9},
     journal = {Dalʹnevosto\v{c}nyj matemati\v{c}eskij \v{z}urnal},
     pages = {127--132},
     publisher = {mathdoc},
     volume = {21},
     number = {2},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DVMG_2021_21_2_a0/}
}