TY  - BOOK
AU  - Lockwood, Elise.
AU  - Lockwood, Elise.
AU  - Purdy, Branwen.
TI  - Two undergraduate students' reinvention of the multiplication principle
U1  - DPer 510.071 J826 November 2017 v. 48 n. 5, Jan-May 2019 v. 50 n. 1-3. 
PY  - 2019///
CY  - Reston, Virginia ; 
PB  - National Council of Teachers of Mathematics , 
KW  -  Computation
KW  - Concept formation
KW  - Mathematical Concepts
N1  - Journal for Research in Mathematics Education, vol. 50, no. 3, pages 225-267, May 2019
ER  -