TITI UDJIANI SRRM; NIKKEN PRIMA PUSPITA; SURYOTO. Eksistensi Invers Moore Penrose Diperumum Elemen Normal Diperumum pada Ring dengan Involusi. Limits: Journal of Mathematics and Its Applications, [S. l.], v. 20, n. 1, p. 107–112, 2023. Disponível em: https://journal.its.ac.id/index.php/limits/article/view/5496. Acesso em: 25 jan. 2026.