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  1. On the algebra of classes of formulae of Jaśkowski's discussive system.Jerzy Kotas - 1971 - Studia Logica 27 (1):81-90.
  • On logical systems with implications and theories of algebras.Jerzy Kotas - 1973 - Studia Logica 31 (1):49 - 72.
  • Logical systems with implications.Jerzy Kotas - 1971 - Studia Logica 28 (1):101 - 117.
  • Allgemeine Logische und Mathematische Theorien.Jerzy Kotas & August Pieczkowski - 1970 - Mathematical Logic Quarterly 16 (6):353-376.
  • About the equivalent theories of algebras with relations.Jerzy Kotas - 1972 - Studia Logica 30 (1):79 - 96.