Ara, T. and Zaman Khan, K. (2010) “Reaction of Dimethyl Sulphoxide and Trifluoroacetic Anhydride with 3-Nitro-4-hydroxycoumarin”, Asian Journal of Chemistry, 22(5), pp. 3397–3403. Available at: https://asianpubs.org/index.php/ajchem/article/view/11561 (Accessed: 18 July 2024).