Characterization of outerplanar graphs with equal 2-domination and domination numbers, Naoki Matsumoto
Theory and Applications of Graphs

Rainbow Perfect and Near-Perfect Matchings in Complete Graphs with Edges Colored by Circular Distance, Shuhei Saitoh, Naoki Matsumoto, Wei Wu
Theory and Applications of Graphs

Facial Achromatic Number of Triangulations with Given Guarding Number, Naoki Matsumoto, Yumiko OHNO
Theory and Applications of Graphs

Note On 6-regular Graphs On The Klein Bottle, Michiko Kasai, Naoki Matsumoto, Atsuhiro Nakamoto, Takayuki Nozawa, Hiroki Seno, Yosuke Takiguchi
Theory and Applications of Graphs