A. D. Utami, R. F. Suwarman, P. Darmawan, T. Listiawan, and I. Rofiki, “VAKSIN (Animated Video for Online Learning System): Support for Independent Asynchronous Learning in Introductory Geometry Courses through SIPEJAR”, JPE, vol. 11, no. 2, pp. 47–55, Jul. 2024.