Agarwal, Shalabh, and Asoke Nath. “Some Challenges in Designing and Implementing Learning Material for Ubiquitous E-Learning Environment: A Descriptive Study”. Recent Advances in Mathematical Research and Computer Science Vol. 8 (February 11, 2022): 70–76. Accessed June 4, 2026. https://stm.bookpi.org/RAMRCS-V8/article/view/5747.