Propolis extracted by different methods:flavonoid content determination and area differentiation evaluation
QU Wen-juan, WANG Ran-ran, LIU Shu-yuan, LI Qian, MA Hai-le
Food and Fermentation Industries . 2014, (05): 246 -251 .  DOI: 10.13995/j.cnki.11-1802/ts.2014.05.009