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![Cover for Stephen Hegedus · Uses of Technology in Upper Secondary Mathematics Education - ICME-13 Topical Surveys (Paperback Book) [1st ed. 2017 edition] (2016)](https://imusic.b-cdn.net/images/item/original/105/9783319426105.jpg?stephen-hegedus-2016-uses-of-technology-in-upper-secondary-mathematics-education-icme-13-topical-surveys-paperback-book&class=scaled&v=1483960928)
![Cover for Stephen Hegedus · The SimCalc Vision and Contributions: Democratizing Access to Important Mathematics - Advances in Mathematics Education (Hardcover Book) [2013 edition] (2012)](https://imusic.b-cdn.net/images/item/original/953/9789400756953.jpg?stephen-hegedus-2012-the-simcalc-vision-and-contributions-democratizing-access-to-important-mathematics-advances-in-mathematics-education-hardcover-book&class=scaled&v=1582901587)