- LICS, page 384-393. IEEE Computer Society, (1994)
- LICS, page 228-233. IEEE Computer Society, (1988)
- LICS, page 75-83. IEEE Computer Society, (1993)
- Mobile Learning, Springer US, 10.1007/978-1-4419-0585-7_7 . (2010)
- J. Symb. Comput. 1(4):329-349 (1985)
- J. Symb. Comput. 6(1):1-18 (1988)
- Theor. Comput. Sci. 67(2&3):173-201 (1989)
- AISC, volume 3249 of Lecture Notes in Computer Science, page 103-117. Springer, (2004)
- Inf. Process. Lett. 43(1):21-27 (1992)
- Inf. Comput. 121(2):172-192 (September 1995)
- J. Log. Comput. 4(3):217-247 (1994)
- CTRS, volume 968 of Lecture Notes in Computer Science, page 1-14. Springer, (1994)
- FroCos, volume 1794 of Lecture Notes in Computer Science, page 245-259. Springer, (2000)
- Kurt Gödel Colloquium, volume 1289 of Lecture Notes in Computer Science, page 1-3. Springer, (1997)
- IEEE T. Instrumentation and Measurement 52(2):371-374 (2003)
- IEEE T. Instrumentation and Measurement 54(2):649-652 (2005)
- Springer, Berlin, (2009)
- IJMBL 2(1):1-21 (2010)
- Appl. Algebra Eng. Commun. Comput. (1994)
- VS Verlag für Sozialwissenschaften, Wiesbaden, (2009)


author