publication venue for
- Sources of differences in children's understandings of mathematical equality: Comparative analysis of teacher guides and student texts in China and the United States. 26:195-217. 2008
- Emergent leadership in children's discussion groups. 25:75-111. 2007
- Why do only some events cause learning during human tutoring?. 21:209-249. 2003
- Contextual Enrichment and Distribution of Practice in the Classroom. 1:341-358. 1984