共 10 条
- [1] AHLEN I, 1970, Ornis Scandinavica, V1, P83, DOI 10.2307/3676027
- [3] Bergman G., 1946, Acta Zoologica Fennica Helsingforsiae, V47, P1
- [4] Bergman G., 1957, Vogelwarte, V19, P15
- [5] FRETWELL S D, 1972, P217
- [6] Hagen Y., 1947, Var Fagelvarld Stockholm, V6, P137
- [7] HAMMOND M. C, 1956, JOUR WILDLIFE MANAGEMENT, V20, P243, DOI 10.2307/3796957
- [9] Kvaerne M., 1973, STERNA, V12, P85