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03D35 Undecidability and degrees of sets of sentences (3 articles)

• Hájek, Petr: Partial conservativity revisited. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 28 (1987), issue 4, pp. 679-690
• Hauschild, Kurt: Model-theoretic properties of cause-and-effect structures. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 23 (1982), issue 3, pp. 541-555
• Švejdar, Vítězslav: Degrees of interpretability. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 19 (1978), issue 4, pp. 789-813