4Bankova V S,Castro S L D,Marcucci M C.Propolis:recent advances in chemistry and plant origin[J].Apidologie,2000,31 (1):3-15.
5Greenaway W,Scaysbrok T,whatley F R.The analysis of bud exudate of Populus euramericana,and of propolis,by Gas Chromatography-Mass Spectrometry[J].Proe R Soc,1987,232 (1268):249-272.
6Wu Y,Sun S,Zhao J,et al.Rapid discrimination of extracts of Chinese propolis and poplar buds by FT-IR and 2D IR correlation spectroscopy[J].J Molecul Struc,2008,(883/884):48-54.