共 20 条
[1]
Batschelet E., 1981, CIRCULAR STAT BIOL
[2]
Borodin A.V., 1984, RED DATA BOOK USSR R, V1
[3]
Cramp S., 1983, HDB BIRDS EUROPE MID
[4]
DIJKSEN AJ, 1973, ARDEA, V61, P159
[5]
Grimmet R.F.A., 1989, IMPORTANT BIRD AREAS
[6]
HOLLOWAY C W, 1970, IUCN (International Union for Conservation of Nature and Natural Resources) Publications New Series, V16, P175
[7]
Ivanow B.E., 1983, Aquila, V90, P29
[8]
JOHNSON A, 1970, Wildfowl, V21, P22
[9]
JOHNSON AR, 1971, UNPUB IWRB GOOSE WOR
[10]
MICHEV TM, 1981, AQUILA, V90, P45