| |
Computers in Human Behavior, Vol. 22, No. 1. (January 2006), pp. 27-42.
|
| |
Cognitive Science, Vol. 21, No. 2. ( 1997), pp. 179-217.
|
| |
Learning and Instruction, Vol. 16, No. 3. (June 2006), pp. 183-198.
|
| |
Journal of Mathematical Behavior (1998), pp. 167-181.
|
| |
Artificial Intelligence for Engineering Design, Analysis and Manufacturing, Vol. 22, No. 02. (2008), pp. 101-116.
|
| |
Learning and Instruction, Vol. 16, No. 3. (June 2006), pp. 213-227.
|
| |
Praxis Grundschule, Vol. 5 (2003), pp. 50-53.
|
| |
On The Move to Meaningful Internet Systems 2003: OTM 2003Workshops (2003), pp. 235-252.
|
| |
Educational Psychology Review, Vol. 19, No. 4. (11 December 2007), pp. 469-508.
|
| |
|
| |
Journal of Computer Assisted Learning, Vol. 24, No. 6. (20081201)
|
| |
Pädagogik und Schulalltag, Vol. 51, No. 3. (1996), pp. 340-350.
|
| |
Zeitschrift für Erziehungswissenschaft, Vol. 4, No. 2. (21 July 2001), pp. 209-224.
|
| |
In International Handbook of Mathematics Education (1996)
|
| |
|
| |
International Journal of Continuing Engineering Education and Lifelong Learning, Vol. 14, No. 1/2. (2004), pp. 121-141.
|
| |
In ICALT (2005), pp. 257-259.
|
| |
In Number Concepts and Operations in the Middle Grades (1988), pp. 119-140.
|
| |
Instructional Science, Vol. 33, No. 1. (January 2005), pp. 73-95.
|
| |
International Journal of Computers for Mathematical Learning, Vol. 9, No. 3. (January 2004), 309.
|
| |
International Journal of Computers for Mathematical Learning, Vol. 9, No. 3. (January 2004), 251.
|
| |
Learning and Instruction, Vol. 12, No. 1. (February 2002), pp. 107-119.
|
| |
|
| |
|
| |
|
| |
International Journal of Computers for Mathematical Learning, Vol. 8, No. 3., 235.
|
| |
International Journal of Computers for Mathematical Learning, Vol. 10, No. 3. (December 2005), pp. 217-249.
|
| |
International Journal of Computers for Mathematical Learning, Vol. 11, No. 3. (October 2006), pp. 361-376.
|
| |
Journal of Mathematical Behavior, Vol. 22, No. 4. (2003), pp. 405-435.
|
| |
Journal of Learning Disabilities, Vol. 40, No. 6. (December 2007), pp. 554-567.
|