Ali, Shaukat, et al. “An Insight of Smartphone-Based Lifelogging Research: Issues, Challenges, and Research Opportunities: Insight of Smartphone-Based Lifelogging Research”. Proceedings of the Pakistan Academy of Sciences: A. Physical and Computational Sciences, vol. 56, no. 3, Mar. 2021, pp. 1-16, http://ppaspk.org/index.php/PPAS-A/article/view/76.