Widodo Winarso, (2017) A case study of misconceptions students in the learning of mathematics; The concept limit function in high school. Bukti Korespondensi Karya Ilmiah Jurnal Jurnal Riset Pendidikan Matematika. e-ISSN :2477-1503. Vol.4 No.1, Program Studi Pendidikan Matematika Pascasarjana Universitas Negeri Yogyakarta.