Cancellative and archimedean Ideal-extensions by commutative semigroups. Y. Kobayashi — 1982 Semigroup forum
Constructing finitely presented monoids which have no finite complete presentation. Y. Kobayashi; M. Katsura — 1997 Semigroup forum
Strongly compatible total orders on free monoids. Y. Kobayashi; T. Saito; T. Iwamoto; K. Kajitori — 1991 Semigroup forum