| Ertl, Kopp & Mandl, 2007Ertl, B., Kopp, B., & Mandl, H. (2007). Supporting Collaborative Learning in Videoconferencing Using Collaboration Scripts and Content Schemes. In F. Fischer, I. Kollar, H. Mandl & HaakeJörg M. (Eds.), Scripting {Computer-Supported} Collaborative Learning (Vol. 6, 213--236). Boston, {MA}: Springer {US}. | Ertl, B., Kopp, B., & Mandl, H. (2007). Supporting Collaborative Learning in Videoconferencing Using Collaboration Scripts and Content Schemes. In F. Fischer, I. Kollar, H. Mandl & HaakeJörg M. (Eds.), Scripting {Computer-Supported} Collaborative Learning (Vol. 6, 213–236). Boston, {MA}: Springer {US}. |
| Ertl, Kopp & Mandl, 2008Ertl, B., Kopp, B., & Mandl, H. (2008). Supporting learning using external representations. Computers \& Education, 51(4), 1599--1608. | Ertl, B., Kopp, B., & Mandl, H. (2008). Supporting learning using external representations. Computers \& Education, 51(4), 1599–1608. |
