Published in Bonner Zoologische Beiträge, in 1998, in volume 48, pages 179-203
Created: 2014-05-26, modified: 2014-05-26![](https://www.biodiversitylibrary.org/pagethumb/40416327,60,60)
Published in Bulletin of The British Ornithologists' Club, in 2003, in volume 123, issue 4, pages 280-285
Created: 2015-08-11, modified: 2015-08-11![](https://www.biodiversitylibrary.org/pagethumb/41807904,60,60)
Published in Scopus, in 1990, in volume 14, pages 24-25
Created: 2014-03-20, modified: 2014-03-20![](https://www.biodiversitylibrary.org/pagethumb/40825120,60,60)
Published in Bulletin of The British Ornithologists' Club, in 1981, in volume 101, pages 355-363
Created: 2012-12-03, modified: 2012-12-03