1. Avron, A. (1990). Gentzenizing Schroeder-Heister’s natural extension of natural deduction. Notre Dame Journal of Formal Logic, 31, 127–135.
2. de Campos Sanz, W., & Piecha, T. (2009). Inversion by definitional reflection and the admissibility of logical rules. Review of Symbolic Logic, 2, 550–569.
3. Došen, K., & Schroeder-Heister, P. (1988). Uniqueness, definability and interpolation. Jounal of Symbolic Logic, 53, 554–570.
4. Dyckhoff, R. (1988). Implementing a simple proof assistant. Workshop on Programming for Logic Teaching (Leeds, 6–8 July 1987): Proceedings 23/1988 (pp. 49–59). Centre for Theoretical Computer Science: University of Leeds.
5. Garner, R. (2009). On the strength of dependent products in the type theory of Martin-Löf. Annals of Pure and Applied Logic, 160, 1–12.