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Environment For Environments: A New Metaphore For Logo Exploring A New Partnership: Children, Teachers And Technology, 1994. ,
Lifting the hood to see how something works, 2000. ,
) I Beg Your Pardon Turtles: Don't Forget About Data Structures, Proceedings of EuroLogo 97, 1997. ,
Kalas are senior lecturers at Comenius University, They are the authors of SuperLogo ,