1. U. Berger. Program extraction from normalization proofs. In M. Bezem and J. Groote, editors, Typed Lambda Calculi and Applications, volume 664 of LNCS, pages 91-106. Springer Verlag, Berlin, Heidelberg, New York, 1993.
2. U. Berger. Uniform Heyting arithmetic. Annals Pure Applied Logic, 133: 125-148, 2005
3. U. Berger, H. Schwichtenberg, and M. Seisenberger. The Warshall Al-gorithm and Dickson’s Lemma: Two Examples of Realistic Program Extraction. Journal of Automated Reasoning, 26: 205-221, 2001.
4. U. Berger, W. Buchholz, and H. Schwichtenberg. Refined program extraction from classical proofs. Annals of Pure and Applied Logic, 114: 3-25, 2002.
5. U. Berger, S. Berghofer, P. Letouzey, and H. Schwichtenberg. Program extraction from normalization proofs. Studia Logica, 82: 27-51, 2006.