Manral (Nee Bora), Dipti, and Madhup Chandra. “Some Mono-, Di- and Triphenyl Substituted Tin Derivatives of 1-Hydroxy 2- Napthonic and 3-Hydoxy 2- Napthonic Acid”. Asian Journal of Chemistry, vol. 6, no. 3, Mar. 2010, pp. 514-22, https://asianpubs.org/index.php/ajchem/article/view/24599.