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Acknowledgments
I am thankful to the Asia Research Center of the National University of Mongolia and the research division of the National Museum of Mongolia for their support. I am also thankful to my daughter, who helped in painting the base shapes of the four animals. Finally, comments from the editor improved the presentation. All photographs and illustrations except Figures 2 and 4 were taken (or designed) by the author. Figures 2 and 4 are public announcement posters from the National Museum of Mongolia and used by permission.
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Ninjbat, U. “The Four Strongest” at the National Museum of Mongolia. Math Intelligencer 42, 9–14 (2020). https://doi.org/10.1007/s00283-020-09979-9
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DOI: https://doi.org/10.1007/s00283-020-09979-9