User Perception Analysis of Online Learning Platform “Zenius” During the Coronavirus Pandemic Using Text Mining Techniques. J. Sistem Inf. (J. Inf. Sys.) [Internet]. 2021 Oct. 25 [cited 2024 Jul. 4];17(2):33-47. Available from: https://jsi-test.pusilkom.com/index.php/jsi/article/view/1065