| Authors(s) | Camphuysen C.J., 1990. Fish stocks, fisheries and seabirds in the North Sea. Techn. Rapport Vogelbescherming nr. 5, Vogelbescherming, Zeist |
| Authors(s) | Camphuysen C.J., 1990. Fish stocks, fisheries and seabirds in the North Sea. Techn. Rapport Vogelbescherming nr. 5, Vogelbescherming, Zeist |