Spaans B.; Stock M.; St. Joseph A.; Bergmann H.-H.; Ebbinge B. S. Breeding biology of dark-bellied brent geese Branta b. bernicla in Taimyr in 1990 in the absence of arctic foxes and under favourable weather conditions. Polar Research, v. 12, n. 2, p. 117-130, 12 Jan. 1993.