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