C. Ozcan, Y. Dilgin, and M. Yaman, “Determination of Quercetin in Medicinal Plants Such as Rose Hip (Rosa canina), Bettle (Urtica dioica), Terebinth (Terebinthina chica) and Purslane (Portulace oleracea) using HPLC-MS Method”, ajc, vol. 24, no. 8, pp. 3396–3400, Apr. 2012.