(en) Nobuhiko Tsunefuka, , « Sumo and the Dohyo (Sumo ring) »(Archive.org • Wikiwix • Archive.is • Google • Que faire ?), EMC on the Internet, No 23 [PDF] « The dohyo of the Edo period had a diameter of 13 shaku (3 m, 94 cm) and this size was enlarged by 61 centimeters at an Emperor’s Sumo match on April 29, 1931 to the current diameter of 15 shaku (4 m, 55 cm) ».
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(en) Nobuhiko Tsunefuka, , « Sumo and the Dohyo (Sumo ring) »(Archive.org • Wikiwix • Archive.is • Google • Que faire ?), EMC on the Internet, No 23 [PDF] « The dohyo of the Edo period had a diameter of 13 shaku (3 m, 94 cm) and this size was enlarged by 61 centimeters at an Emperor’s Sumo match on April 29, 1931 to the current diameter of 15 shaku (4 m, 55 cm) ».
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(en) Nobuhiko Tsunefuka, , « Sumo and the Dohyo (Sumo ring) »(Archive.org • Wikiwix • Archive.is • Google • Que faire ?), EMC on the Internet, No 23 [PDF] « The dohyo of the Edo period had a diameter of 13 shaku (3 m, 94 cm) and this size was enlarged by 61 centimeters at an Emperor’s Sumo match on April 29, 1931 to the current diameter of 15 shaku (4 m, 55 cm) ».
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(en) Nobuhiko Tsunefuka, , « Sumo and the Dohyo (Sumo ring) »(Archive.org • Wikiwix • Archive.is • Google • Que faire ?), EMC on the Internet, No 23 [PDF] « The dohyo of the Edo period had a diameter of 13 shaku (3 m, 94 cm) and this size was enlarged by 61 centimeters at an Emperor’s Sumo match on April 29, 1931 to the current diameter of 15 shaku (4 m, 55 cm) ».
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(en) Nobuhiko Tsunefuka, , « Sumo and the Dohyo (Sumo ring) »(Archive.org • Wikiwix • Archive.is • Google • Que faire ?), EMC on the Internet, No 23 [PDF] « The dohyo of the Edo period had a diameter of 13 shaku (3 m, 94 cm) and this size was enlarged by 61 centimeters at an Emperor’s Sumo match on April 29, 1931 to the current diameter of 15 shaku (4 m, 55 cm) ».
