HANSSEN, Calvin; FRAN, Fransiskus; YUNDARI, Yundari. The Complexity of Pencil Graph and Line Pencil Graph. PYTHAGORAS Jurnal Matematika dan Pendidikan Matematika, [S. l.], v. 19, n. 2, p. 115–125, 2024. DOI: 10.21831/pythagoras.v19i2.77747. Disponível em: https://journal.uny.ac.id/index.php/pythagoras/article/view/77747. Acesso em: 9 jul. 2025.