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![Cover for Leen Streefland · Fractions in Realistic Mathematics Education: A Paradigm of Developmental Research - Mathematics Education Library (Paperback Book) [Softcover reprint of the original 1st ed. 1991 edition] (2012)](https://imusic.b-cdn.net/images/item/original/976/9789401053976.jpg?leen-streefland-2012-fractions-in-realistic-mathematics-education-a-paradigm-of-developmental-research-mathematics-education-library-paperback-book&class=scaled&v=1608677039)
![Cover for Leen Streefland · The Legacy of Hans Freudenthal (Paperback Book) [Softcover reprint of hardcover 1st ed. 1994 edition] (2010)](https://imusic.b-cdn.net/images/item/original/542/9789048143542.jpg?leen-streefland-2010-the-legacy-of-hans-freudenthal-paperback-book&class=scaled&v=1608725530)
![Cover for Leen Streefland · Fractions in Realistic Mathematics Education: A Paradigm of Developmental Research - Mathematics Education Library (Hardcover Book) [1991 edition] (1991)](https://imusic.b-cdn.net/images/item/original/826/9780792312826.jpg?leen-streefland-1991-fractions-in-realistic-mathematics-education-a-paradigm-of-developmental-research-mathematics-education-library-hardcover-book&class=scaled&v=1608672277)