Ojha, K.G., and Heer Tahiliani. “Antibacterial Activity of Some Substituted (1,4)-Benzothiazino-(2,3-B)-Phenothiazines”. Asian Journal of Chemistry, vol. 13, no. 2, Mar. 2010, pp. 785-6, https://asianpubs.org/index.php/ajchem/article/view/22672.