TY - JOUR T1 - Extending a Virtual Chemistry Laboratory with a Collaboration Script to Promote Conceptual Learning AU - Tsovaltzi, D. AU - Rummel, N. AU - McLaren, B. M. AU - Pinkwart, N. AU - Scheuer, O. AU - Harrer, A. AU - Braun, I. JO - International Journal on Technology Enhanced Learning PY - 2010 VL - 2 IS - 12 ER -