Yu, P.-T., Y.-H. Liao, M.-H. Su, P.-J. Cheng, and C.-H. Pai. “A Rapid Auto-Indexing Technology for Designing Readable E-Learning Content”. The International Review of Research in Open and Distributed Learning, Vol. 13, no. 5, Nov. 2012, pp. 20-38, doi:10.19173/irrodl.v13i5.1246.