Bawankar, S.V., et al. “Synthesis and Physico-Chemical Studies of Newly Synthesized Terpolymers Derived from Salicyladehyde, Biuret and Trioxane”. Asian Journal of Chemistry, vol. 11, no. 4, July 2012, pp. 1185-04, https://asianpubs.org/index.php/ajchem/article/view/23467.