Authors: MACIEJOK J SAUR B BERGMANN HH

Citation: J. Maciejok et al., BEHAVIOR OF CHAFFINCHES (FRINGILLA COELEB S) INSIDE AND OUTSIDE THEIRTERRITORIES DURING THE BREEDING PERIOD, Journal fur Ornithologie, 136(1), 1995, pp. 37-45

Authors: TIMCKE A BERGMANN HH

Citation: A. Timcke et Hh. Bergmann, SEASONALLY CHANGING BIRD CALL - THE TRILL CALL OF MALE SHELDUCKS (TADORNA-TADORNA), Journal fur Ornithologie, 135(1), 1994, pp. 95-100

Authors: SPAANS B STOCK M STJOSEPH A BERGMANN HH EBBINGE BS

Citation: B. Spaans et al., BREEDING BIOLOGY OF DARK-BELLIED BRENT GEESE BRANTA-BERNICLA-BERNICLAIN TAIMYR IN 1990 IN THE ABSENCE OF ARCTIC FOXES AND UNDER FAVORABLE WEATHER CONDITIONS, Polar research, 12(2), 1993, pp. 117-130