@article{'Bos2013TakkelingA',
   title     = {'De Sperwer Accipiter nisus als broedvogel in de provincie Groningen in 2012'},
   author    = {'Bos', 'Johan'},
   journal   = {'De Takkeling'},
   volume    = {21},
   number    = {2},
   pages     = {124--131},
   year      = {2013}
}