共 26 条
[21]
SCHAANING HTL, 1916, DANSK ORNITH FOREN T, V9, P145
[22]
Siegel S., 1956, NONPARAMETRIC STAT B
[23]
SOUTHERN HN, 1970, J ZOOL, V162, P197
[24]
Watson A, 1970, P167
[25]
WITHERBY HF, 1944, HDB BRIT BIRDS, V5
[26]
1970, B ECOLOGICAL RESEARC, V9, P49