- Camphuysen 1992
- Karakteristieken van in 1985 in Nederland gestrande Middelste Jagers Stercorarius pomarinus. Sula 6(4): 139-147
- , Lockyer 1988
- Killer Whaler (Orcinus orca) in Faroes waters. Rit Fiskideildar 11: 55-64
- Couperus 1994
- Killer Whales Orcinus orca scavenging on discards of freezer trawlers north east of the Shetland islands. Aquatic Mammals 20: 47-51
- Fuchs 1977
- Kleptoparasitism of Sandwich Terns Sterna sandvicensis by Black-headed Gulls Larus ridibundus. Ibis 119: 183-190
- Kieckbusch, 1996
- Kormoranmonitoring in Schleswig-Holstein. Vogelwelt 117: 349-354