Hao Yin, K. A. L. A. B. (2019) “Study on Urban Elder Mobile Phone Users in China: In the Perspective of Aging Issue”, International Journal of Control and Automation, 12(5), pp. 99 - 106. Available at: http://sersc.org/journals/index.php/IJCA/article/view/1420 (Accessed: 20April2024).