Programming to Explore Geometrical and Physics.Concepts: Learning Processes and Microworld Design C.T.I. Technical Report TR 94.06.35 - Γεωργιάδης, Παναγιώτης; Κυνηγός, Χρόνης (Ινστιτούτο Τεχνολογίας Υπολογιστών Computer Technology Institute Computer Science and Engineering Department, Patras University, 1994)