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- [2] UNIVERSAL CLASSES OF ALGEBRAS WHICH ARE FREE IN SOME INFINITE POWER NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1973, 20 (03): : A338 - A338
- [3] UNIVERSAL CLASSES OF MONADIC ALGEBRAS ZEITSCHRIFT FUR MATHEMATISCHE LOGIK UND GRUNDLAGEN DER MATHEMATIK, 1976, 22 (01): : 35 - 44
- [7] CHARACTERIZATIONS OF SOME CLASSES OF SEMIGROUPS ACTA SCIENTIARUM MATHEMATICARUM, 1984, 47 (1-2): : 55 - 59