共 37 条
[3]
[Anonymous], 1962, FLORA BRIT ISLES
[4]
BAKKER D., 1960, Biology of Weeds, Symp. Brit. ecol. Soc., P205
[6]
BOSTOCK SJ, 1976, THESIS U MANCHESTER
[7]
CHANCELLOR RJ, 1970, 10TH P BRIT WEED CON, P1114
[8]
DAHLBERG G, 1940, STATISTICAL METHODS