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Jones, Ian and Pratt, Dave (2012) A substituting meaning for the equals sign in arithmetic notating tasks. Journal for Research in Mathematics Education, 43 (1). pp. 2-33. ISSN 0021-8251 (In Press)
Jones, Ian and Pratt, Dave (2006) Connecting the equal sign. International Journal of Computers for Mathematical Learning, 11 (3). pp. 301-325. ISSN 13823892 (Print) 15731766 (Online)