., Arman, Alang ., and Yusrianto Malago. “Information System Analysis of Assistance Services for Persons With Social Welfare Problems Based on Android Towards Smart City”. KnE Social Sciences 4, no. 14 (November 11, 2020): 90–98. Accessed June 21, 2021. https://knepublishing.com/index.php/KnE-Social/article/view/7861.