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Author: Saitô, Tôru

• Saitô, Tôru: Archimedean classes in an ordered semigroup. IV. (English). Czechoslovak Mathematical Journal, vol. 37 (1987), issue 1, pp. 86-119
• Saitô, Tôru: Archimedean classes in an ordered semigroup. I. (English). Czechoslovak Mathematical Journal, vol. 26 (1976), issue 2, pp. 218-238
• Saitô, Tôru: Archimedean classes in an ordered semigroup. II. (English). Czechoslovak Mathematical Journal, vol. 26 (1976), issue 2, pp. 239-247
• Saitô, Tôru: Archimedean classes in an ordered semigroup. III. (English). Czechoslovak Mathematical Journal, vol. 26 (1976), issue 2, pp. 248-251