Article in journal
Report number 107 from Kvismare Bird Observatory:

Nestling provisioning in polygynous great reed warblers (Acrocephalus arundinaceus): do males bring larger prey to compensate for fewer nest visits?

Sejberg D, Bensch S & Hasselquist D.

Published 2000 in Behavioural Ecology and Sociobiology , volume 47, pp. 213-219.