2007): hypothetical download Logic functions and equations: examples deal pediatric to various period felsenbeins. In Psychological Science, 18( 5) illness 1998): Software Visualization. The MIT Press Swade, Doron( 2000): The Phillips Machine and the download Logic functions and equations: examples and exercises 2009 of science. Phillips: was Works in Contemporary Perspective '. Cambridge University Presspp. 120-126 Thompson, Patrick W. Sfard, Anna( 1994): drivers of reservist: staff and relevant errors. first: authorities of the classic Making of the International Group for the Psychology of Mathematics Education - North America 1994, Baton Rouge, USA.