Liao, Yijing, et al. “Determination on the Dissolution Rate of Doxepin Hydrochloride Tablets Produced by Different Manufacturers in China With Fiber-Optic Medicine Dissolution Release Rate Process Test System”. Asian Journal of Chemistry, vol. 25, no. 15, Sept. 2013, pp. 8587-92, doi:10.14233/ajchem.2013.14853.