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Gravemeijer, K., M. A. Pligge, and B. Clarke. "Reallotment." In Mathematics in Context. National Center for Research and Mathematical Sciences Education and Freudenthal Institute (eds.). Chicago: Encyclopaedia Britannica Educational Corporation, 1998.

Lappan, G., J. Fey, W. Fitzgerald, S. Friel, and R. Phillips. Connected Mathematics: Covering and Surrounding. Palo Alto, CA: Dale Seymour Publications, 1996.

 

 
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