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Hildebrand, A. R., Connors, M., Pilkington, M., Ortíz Alemán, C., & Chávez, RE. (1998). Mapping Chicxulub Crater Structure with Gravity and Seismic Reflection Data. Meteorites: Flux with Time and Impact Effects, 140,, 155–176.
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Baumstark, K., & Graf, S. (2014). A Framework for Integrating Motivational Techniques in Technology Enhanced Learning. (pp. 150–160). Lecture Notes in Computer Science. Springer Berlin Heidelberg.
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Lin, C. - H., Liu, E.Z.-F., Cheng, S.-S., Ko, H.-W., & Chang, M. (2008). To Be an e-Tutor Or Not to Be an e-Tutor. In In the Proceedings of the 7th WSEAS International Conference on E-ACTIVITIES (E-Learning, E-Communities, E-Commerce, E-Management, E-Marketing, E-Governance, Tele-Working) (pp. 149–153). Cairo, Egypt: In the Proceedings of the 7th WSEAS International Conference on E-ACTIVITIES.
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Lin, C. - H., Liu, E.Z.-F., Cheng, S.-S., Ko, H.-W., & Chang, M. (2008). To Be an e-Tutor Or Not to Be an e-Tutor. In the 7th WSEAS International Conference on E-ACTIVITIES (pp. 149–153). Cairo.
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Kumar, V. S., Anjaneyulu, K. S. R., & Gupte, U. A. (1997). Vidya: A situated CALL environment. Computer assisted language learning, 10(2), 149–172.
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