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Kaikki 2s julkaisut Sacha La Bastide-van Gemert
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![Cover for Sacha La Bastide-van Gemert · All Positive Action Starts with Criticism: Hans Freudenthal and the Didactics of Mathematics (Paperback Book) [Softcover reprint of the original 1st ed. 2015 edition] (2016)](https://imusic.b-cdn.net/images/item/original/783/9789402401783.jpg?sacha-la-bastide-van-gemert-2016-all-positive-action-starts-with-criticism-hans-freudenthal-and-the-didactics-of-mathematics-paperback-book&class=scaled&v=1590496122)
![Cover for Sacha La Bastide-van Gemert · All Positive Action Starts with Criticism: Hans Freudenthal and the Didactics of Mathematics (Hardcover Book) [2015 edition] (2015)](https://imusic.b-cdn.net/images/item/original/339/9789401793339.jpg?sacha-la-bastide-van-gemert-2015-all-positive-action-starts-with-criticism-hans-freudenthal-and-the-didactics-of-mathematics-hardcover-book&class=scaled&v=1511511409)