YAACOB, Nazeeruddin; SANUGI, Bahrom. A New Fourth-Order Embedded Method Based on the Harmonic Mean. MATEMATIKA, [S. l.], v. 14, p. 1–6, 1998. DOI: 10.11113/matematika.v14.n.475. Disponível em: https://matematika.utm.my/index.php/matematika/article/view/475. Acesso em: 4 may. 2024.