Edward A Silver and Sandra P Marshall, "Mathematical and Scientific Problem Solving: Findings, Issues,
and Instructional Implications," in Dimensions of Thinking and Cognitive Instructions, ed. Beau Fly Jones
et al. (Hillside, New Jersey: Lawrence Erlbaum Associates, Inc., Publishers 1990), 266.
>2) Silver, "Mathematical and Scientific Problem Solving", 270.
>3) Roger Howe and Susana S Epp, "Taking Place Value Seriously: Arithmetic, Estimation, and Algebra," Essay,
Yale University 2008, 39.
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