Article in journal
Report number 112 from Kvismare Bird Observatory:

Brood sex ratios, female harem status and resources for nestling provisioning in the great reed warbles (Acrocephalus arundinaceus).

Westerdahl H, Bensch S, Hansson B, Hasselquist D & von Schantz T.

Published 2000 in Behavioural Ecology and Sociobiology , volume 47, pp. 312-318.