共 32 条
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ALMOND EL, 1950, BRIT BIRDS, V43, P336
[3]
BALDA RP, 1980, Z TIERPSYCHOL, V52, P331
[6]
GIBB JOHN A., 1960, IBIS, V102, P163, DOI 10.1111/j.1474-919X.1960.tb07112.x
[7]
HAFTORN S, 1953, DET KGL NORSKE VIDEN
[8]
HAFTORN S, 1956, DET KGL NORSKE VIDEN
[9]
Hart D., 1958, British Birds, V51, P122