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).

Authors (ref)
Westerdahl H, Bensch S, Hansson B, Hasselquist D & von Schantz T
Article in journal
Behavioural Ecology and Sociobiology . 2000. Volume 47, page(s) 312-318.