Krassmann, A. L.; Herpich, F.; Bercht, M.; Cazella, S. C. Analyzing Trends in Academic Papers about Ubiquitous Virtual Worlds in Education Using Text Mining. Int J Innov Educ Res 2017, 5 (4), 167-180. https://doi.org/10.31686/ijier.vol5.iss4.650.