Affiliation: | 1. Laboratoire Leibniz-IMAG, Université Joseph Fourier, 46 av. Felix Viallet, F-38031, Grenoble Cedex 1, France 2. National Center for Improving Student Achievement in Mathematics and Science (NCISLA), Wisconsin Center for Educational Research, 1025 W. Johnson Street, 5376, Madison, WI, USA 3. Universit?t Hamburg, Fachbereich 6, Von-Melle-Park 8, D-20146, Hamburg
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