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Author: D'Alarcao, Hugo

• D'Alarcao, Hugo: Biregular semigroups. I. (English). Czechoslovak Mathematical Journal, vol. 20 (1970), issue 4, pp. 544-548
• D'Alarcao, Hugo: Biregular semigroups. II. (English). Czechoslovak Mathematical Journal, vol. 20 (1970), issue 4, pp. 549-555