@incollection{'Bos2004LBR',
   title     = {'Colour-ringed Mediterranean Gulls in Lothian'},
   author    = {'Bos', 'Johan'},
   booktitle = {'Lothian Bird Report 2003'},
   editor    = {'Andrews', 'I. J.'},
   pages     = {98--102},
   year      = {2004}
}