Grigori Mints. Countable Version of Omega-Rule. In Lev D. Beklemishev, Ruy de Queiroz, editors, Logic, Language, Information and Computation - 18th International Workshop, WoLLIC 2011, Philadelphia, PA, USA, May 18-20, 2011. Proceedings. Volume 6642 of Lecture Notes in Computer Science, pages 201-209, Springer, 2011. [doi]
Abstract is missing.