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References
- 1 2 3 4 5 "Nihon Ki-in: Judan Title". Archived from the original on 2007-04-23. Retrieved 2007-02-21.
- 1 2 3 4 5 6 7 8 9 10 "Judan title from Igo-Kisen". Archived from the original on 2007-02-22. Retrieved 2007-02-21.