ULFA, N. .; JUPRI, A. .; DARHIM; KARTIKA. Analysis of Learning Obstacles of Junior High School Students on The Topic of Circle. Proceeding International Conference on Science and Engineering, [S. l.], v. 3, p. 599–603, 2020. DOI: 10.14421/icse.v3.572. Disponível em: http://sunankalijaga.org/prosiding/index.php/icse/article/view/572. Acesso em: 2 jun. 2026.