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Author: Okamoto, Futaba

• Okamoto, Futaba; Rasmussen, Craig W.; Zhang, Ping: Set vertex colorings and joins of graphs. (English). Czechoslovak Mathematical Journal, vol. 59 (2009), issue 4, pp. 929-941
• Okamoto, Futaba; Zhang, Ping; Saenpholphat, Varaporn: The upper traceable number of a graph. (English). Czechoslovak Mathematical Journal, vol. 58 (2008), issue 1, pp. 271-287