Study on the extraction of ursolic acid and oleanolic acid of Prunella vulgaris by semi-bionic method
FAN Baorui, MA Fengbo, LIU Hui, QIU Mingheng, LI Haiying
Journal of Hebei University (Natural Science Edition) . 2019, (6): 605 -610 .  DOI: 10.3969/j.issn.1000-1565.2019.06.007