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The Baire Category Theorem in Weak Subsystems of Second-Order Arithmetic., and . J. Symb. Log., 58 (2): 557-578 (1993)Periodic Points and Subsystems of Second-Order Arithmetic., , and . Ann. Pure Appl. Log., 62 (1): 51-64 (1993)Degrees of Unsolvability: A Tutorial.. CiE, volume 9136 of Lecture Notes in Computer Science, page 83-94. Springer, (2015)A Nonstandard Counterpart of WWKL., and . Notre Dame J. Formal Log., 52 (3): 229-243 (2011)Turing Degrees and Muchnik Degrees of Recursively Bounded DNR Functions.. Computability and Complexity, volume 10010 of Lecture Notes in Computer Science, page 660-668. Springer, (2017)Countable algebra and set existence axioms., , and . Ann. Pure Appl. Log., 25 (2): 141-181 (1983)Measure theory and weak König's lemma., and . Arch. Math. Log., 30 (3): 171-180 (1990)Factorization of polynomials and Σ10 induction., and . Ann. Pure Appl. Log., (1986)A dual form of Erdös-Rado's canonization theorem., , and . J. Comb. Theory A, 42 (2): 159-178 (1986)Nichtbeweisbarkeit von gewissen kombinatorischen Eigenschaften endlicher Bäume.. Arch. Math. Log., 25 (1): 45-65 (1985)