@article{'Bos2013TakkelingB',
   title     = {'De Sperwer Accipiter nisus als broedvogel in de provincie Groningen in 2013'},
   author    = {'Bos', 'Johan'},
   journal   = {'De Takkeling'},
   volume    = {21},
   number    = {3},
   pages     = {204--208},
   year      = {2013}
}