SUMEKAR, W.; NURHASANAH, F.; SUTOPO, S. Analyzing students’ abstraction in learning common tangent lines of two circles based on cognitive styles. Beta: Jurnal Tadris Matematika, [S. l.], v. 12, n. 2, p. 94–108, 2019. DOI: 10.20414/betajtm.v12i2.325. Disponível em: https://mail.jurnalbeta.ac.id/index.php/betaJTM/article/view/325. Acesso em: 17 apr. 2026.