4Steffen A, Pawliszyn J. Analysis of flavor volatiles using headspace solid2 phase micro extraction[J]. Journal of Agrieuhural and Food Chemistry, 1996, 44 (8): 2187-2193.
6Takeo T. Characteristics of the aroma constitution found in native China black teas[J]. Agricultural and Biological Chemistry, 1983, 47(6): 1377-1379.