Stefanova, Milena. “A SCHEMATIC PROOF OF STRONG NORMALIZATION FOR THE SYSTEMS OF THE $\lambda$-CUBE*”. Ann. Sofia Univ. Fac. Math. and Inf. 90 (December 12, 1998): 17–40. Accessed November 21, 2024. https://stipendii.uni-sofia.bg/index.php/fmi/article/view/284.