@article{'BosKooten1993',
   title     = {'Broedzorgdeling van twee sperwervrouwtjes Accipiter nisus'},
   author    = {Bos, Johan and 'Van Kooten', 'Theo'},
   journal   = {'Limosa'},
   volume    = {66},
   pages     = {161--163},
   year      = {1993}
}