Maksimova, Larisa. „Interpolation and Implicit Definability in Extensions of the Provability Logic”. Logic and Logical Philosophy 17, no. 1-2 (czerwiec 19, 2008): 129–142. Udostępniono lipiec 18, 2024. https://apcz.umk.pl/LLP/article/view/LLP.2008.008.