4Muller J. Fossil pollen records of extant angiosperms [J]. The Botanical Review, 1981,47(1) : 1-142. 被引量:1
5Callaham D, DelTredici P, Torrey J G. Isolation and cultivation in vitro of the actinomyeete causing root nodulation in Comptonia [J] Science, 1978, 199: 899-902. 被引量:1