Geodesic
Periodic ultradiscrete plane transformation with a period of 12
Dalʹnevostočnyj matematičeskij žurnal, Tome 21 (2021) no. 2, pp. 231-233.

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V.A. Bykovskii constructed a new periodic ultradiscrete plane transformation with a period of 12. In his work only the idea of proving this periodicity was proposed. We provide a complete and detailed proof of this statement. 
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M. D. Monina. Periodic ultradiscrete plane transformation with a period of 12. Dalʹnevostočnyj matematičeskij žurnal, Tome 21 (2021) no. 2, pp. 231-233. http://geodesic.mathdoc.fr/item/DVMG_2021_21_2_a8/

[1] V. A. Bykovskii, “Periodicheskie ultradispersnye preobrazovaniya ploskosti”, Doklady Rossiiskoi akademii nauk. Matematika, informatika, protsessy upravleniya, 500 (2021), 53–55 | DOI

[2] A. Nobe, “Ultradiscrete QRT maps and tropical elliptic curves”, J. Journal of Physics A: Mathematical and Theoretical, 41:12 (2008), 12 pp. | MR

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[5] Chris Ormerod, An ultradiscrete QRT mapping from tropical elliptic curves, 2006, arXiv: math-ph/0609060v1