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2. Clagett, M.: 1959,The Science of Mechanics in the Middle Ages, University of Wisconsin Press, Madison.
3. Clement, J.: 1982, ?Students' Preconceptions in Elementary Mechanics?,AJP 50, 66?71.
4. Clement, J.: 1983, ?A Conceptual Model Discussed by Galileo and Used Intuitively by Physics Students?, in D. Gentner and A. Stevens (eds.),Mental Models, Lawrence Erlbaum, Hillsdale, New Jersey, pp. 325?40.
5. Champagne, A. B., L. E. Klopfer and J. H. Anderson: 1980, ?Factors Influencing Learning of Classical Mechanics?,AJP 48, 1074?79.