Cytotoxic phenolic constituents from the leaves of Ehretia asperula - Kim, Dang Dinh; Nguyet, Vu Thi; Anh, Ha Xuan; Trang, Nguyen Thi Thu; Chuyen, Nguyen Hong; Huong, Le Mai; Ha, Tran Thi Hong; Ho, Do Hai; Dat, Nguyen Tien (Bangladesh Journal of Pharmacology, 2019)