Baillie, S.R., Boobyer, G., Perrins, C.M., Brenchley, A., Bryant, D.M., Ormerod, S.J., Rehfisch, M.M., Tasker, M.L. & Wilson, J.D. 1999. The conservation uses of ringing data. Conclusions of the JNCC/BTO Workshop, 4-5 November 1995, Norwich. Ringing & Migration 19: 127.