PARVESH SHARMA; DR. KAPIL KUMAR; PROF. (DR.) HIMANSHU A. PANDYA. DETERMINATION OF BALLPOINT AND GEL PEN INKS USING UV VIS SPECTROSCOPY. Journal of Population Therapeutics and Clinical Pharmacology, [S. l.], v. 26, n. 3, p. 77–106, 2019. DOI: 10.53555/6q8wak31. Disponível em: https://jptcp.com/index.php/jptcp/article/view/9131. Acesso em: 1 nov. 2025.