1. Zhi, C., Guangyuang, S., Xiuyun, P.: The knowledge point is the cognitive unit of the person. Psychol. Sci. 25(3), 369–370 (2002)
2. Shengquan, Y., Qi, W., Yuntao, Y., et al.: Research on international standards proposal learning cell. China Educ. Technol. (11) 64–70 (2018)
3. Ping, Y., Zhiting, Z.: The study of content standards for open educational resources. Open Educ. Res. 20(1), 111–120 (2014)
4. Yang Jiumin, X., Ke, H.J., et al.: The interaction effects of the type of cues and learners’ prior knowledge on learning in video lectures. Modern Distance Educ. Res. 32(01), 93–101 (2020)
5. Bian, J., Huang, M.L.: Semantic topic discovery for lecture video. In: Bi, Y., Bhatia, R., Kapoor, S. (eds.) Intelligent Systems and Applications, IntelliSys 2019, Advances in Intelligent Systems and Computing, vol. 1037, pp. 457–466. Springer, Cham (2020). https://doi.org/10.1007/978-3-030-29516-5_36