Adrian Treffers

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Klein, A. S., Beishuizen, M., & Treffers, A. (1998). The empty number line in Dutch second grades: Realistic versus gradual program design. Journal for Research in Mathematics Education, 29(4), 443–464. doi:10.2307/749861

Treffers, A. (1993). Wiskobas and Freudenthal: Realistic Mathematics Education. Educational Studies in Mathematics, 25(1-2), 89–108. doi:10.1007/BF01274104

Treffers, A. (1987). Three dimensions: A model of goal and theory description in mathematics instruction -- The Wiskobas Project (p. 351). Dordrecht, The Netherlands: D. Reidel.