Studying of the optical properties of poly (vinyl alcohol) films using Aluminum sulphate as additive by measuring allowed direct transition energy gap. Baghdad Science Journal, Iraq, Baghdad, v. 8, n. 1, p. 103–109, 2011. DOI: 10.21123/bsj.2011.8.1.103-109. Disponível em: https://bsj.uobaghdad.edu.iq/index.php/BSJ/article/view/1141.. Acesso em: 3 may. 2024.