Witwit, Noora Asaad. “Study of the Optical Properties of poly(vinyl Chloride)-4-[(5-Mercapto-1,3,4-Thiadiazol-2-yl)diazenyl]phenol Complexes”. European Journal of Chemistry, vol. 5, no. 4, Dec. 2014, pp. 652-6, doi:10.5155/eurjchem.5.4.652-656.1100.