Madhava Rao, B., and M.J. Kulkarni. “A Titrimetric Estimation of Ammonium Thiocyanate, Thiourea, N-Phenylthiourea,N, N&Acute; -Diphenylthiourea and Thiosemicarbzide With Ammonium Hexanitratocerate(IV) in Perchloric Acid Medium ”. Asian Journal of Chemistry, vol. 5, no. 1, Mar. 2010, pp. 144-9, https://asianpubs.org/index.php/ajchem/article/view/24764.