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Ainley, Janet and Nardi, Elena and Pratt, Dave (2001) Normalising: children's activity to construct meanings for trend. Educational Studies in Mathematics, 45 (1/3). pp. 131-146. ISSN 00131954 (Print) 15730816 (Online)
Ainley, Janet and Nardi, Elena and Pratt, Dave (2000) The construction of meanings for trend in active graphing. International Journal of Computers for Mathematical Learning, 5 (2). pp. 85-114. ISSN 1382-3892 (print); 1573-1766 (electronic)