1. X. Chen,The Radio and Electronic Engineer,53(1983)2, 67–74.
2. M. A. Tapia,Int. J. Electronics,67(1989)5, 703–715.
3. J. T. Butler, K. A. Schueller, Worst Case Number of Terms in Symmetric Multivalued Functions, Proc. 21th. ISMVL, Victoria: 1991, 94–101.
4. X. Chen, Logic Design Technique with Full-Adders,Bulletin of Science and Technology,6(1990)1, 1–5, (in Chinese).
5. X. Chen, The Research of Symmetric Function Based on AND-Exclusive OR Algebraic System,Journal of Hangzhou University,21(1994)3, 291–297, (in Chinese).