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  1. Undecidability of the Homogeneous Formulas of Degree 3 of the Predicate Calculus.August Pieczkowski - 1968 - Studia Logica 22 (1):7 - 16.
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  • Über Theorien Im Erweiterten Sinne.August Pieczkowski - 1974 - Studia Logica 33 (4):317-331.
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