ASHRAF, Mohamed; QADIR, Muhammad Imran. Relation of Premature Greying of Hair with Urine Nitrite. Research and Analysis Journal, [S. l.], v. 2, n. 9, p. Page No. 133 – 115, 2019. Disponível em: http://rajournals.com/index.php/raj/article/view/53. Acesso em: 3 apr. 2025.