Mohammad Imam Utoyo, Er Ayu Nurafifah, and Miswanto. “nalisis odel atematika rde raksional enyebaran orm erbasis i-i ada martphone”. imits: ournal of athematics and ts pplications, vol. 15, no. 2, Nov. 2018, pp. 97-112, https://journal.its.ac.id/index.php/limits/article/view/5385.