共 7 条
- [1] CORNWALLIS RK, 1964, BTO GUIDE AGEING SEX
- [3] GIBB J, 1950, IBIS, V92, P501
- [4] Kluijver H. N., 1951, Ardea, V39, P1
- [5] Lack D., 1954, P343
- [6] Lohrl H., 1968, Journal fuer Ornithologie Leipzig, V109, P383, DOI 10.1007/BF01671571
- [7] PERRINS CM, 1963, THESIS OXFORD, P1