(1994)
(1997)
World Wide Web, Vol. 7, No. 1. (March 2004), pp. 83-109.
(2005)
Journal for Research in Mathematics Education, Vol. 23, No. 5. (1992), pp. 441-467.
Educational Studies in Mathematics, Vol. 59, No. 1-3. (July 2005), pp. 85-112.
The American Mathematical Monthly, Vol. 74, No. 1. (1967), pp. 38-55.
(1 February 2005)
Annals of Mathematics and Artificial Intelligence, Vol. 21, No. 1. (1997), pp. 1-11.
Physical Review Letters, Vol. 63 (27 November 1989), 2443.
(22 Jan 2003)
Electron. Notes Theor. Comput. Sci., Vol. 172 (2007), pp. 437-458.
Bulletin of the European Association for Theoretical Computer Science, Vol. 62 (1997), pp. 222-259.
Journal of Computer and System Sciences, Vol. 57, No. 3. (December 1998), pp. 272-288.
World Wide Web, Vol. 4, No. 3. (2001), pp. 167-187.
No. -86. (1989)
No. -86. (1989)
Commun. ACM, Vol. 21, No. 8. (August 1978), pp. 613-641.
: Perspectives in Conceptual Modeling (2005), pp. 194-207.
(2001)
(18 April 2002)
No. UT-CS-94-270. (1994)
Finite Fields and Their Applications, Vol. 10, No. 1. (January 2004), pp. 113-122.
Linear Algebra and its Applications, Vol. 67 (June 1985), pp. 81-97.
The Annals of Statistics, Vol. 21, No. 2. (1993), pp. 867-889.
(3 Mar 2003)
Biometrika, Vol. 53 (1966), pp. 325-338.
(15 October 1996)
(6 Jun 2003)
(8 Dec 2003)
(1996)
(16 Jun 2005)
(17 Oct 2006)
Informatique Theorique et Applications, Vol. 33, No. 4/5. (1999), pp. 401-426.
(2000), pp. 309-385.
Topology and its Applications, Vol. 137, No. 1-3. (28 February 2004), pp. 125-158.
(1991)
(1991), pp. 357-390.
Adv. Math., Vol. 121 (1996), pp. 196-244.
Algebra Universalis, Vol. 26, No. 3. (21 October 1989), pp. 367-379.
: Algebraic and Coalgebraic Methods in the Mathematics of Program Construction: International Summer School and Workshop, Oxford, UK, April 10-14, 2000. Revised Lectures (2002), 203.