Article in journal
Report number 90 from Kvismare Bird Observatory:

The timing of post-juvenile moult and fuel deposition in relation to the onset of autumn migration in Reed Warblers Acrocephalus scirpaceus and Sedge Warblers Acrocephalus schoenobaenus.

Hall S.

Published 1996 in Ornis Svecica , volume 6, pp. 89-96.