Rapid analysis of the essential oils from dried Illicium verum Hook. f. and Zingiber officinale Rosc. by improved solvent-free microwave extraction with three types of microwave-absorption medium. - Wang,Z.; Wang,L.; Li,T.; Zhou,X.; Ding,L.; Yu,Y.; Yu,A.; Zhang,H. (Anal Bioanal Chem, 2006)