Ozcan, C. et al. 2012. 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. Asian Journal of Chemistry. 24, 8 (Apr. 2012), 3396–3400.