SIMORANGKIR, D. S.; NAPITUPULU, E. . Pengaruh Konsentrasi Belajar terhadap Kemampuan Pemecahan Masalah Matematis Siswa. Formosa Journal of Science and Technology , [S. l.], v. 1, n. 6, p. 711–722, 2022. DOI: 10.55927/fjst.v1i6.1597. Disponível em: https://journal.formosapublisher.org/index.php/fjst/article/view/1597. Acesso em: 29 may. 2026.