| Authors(s) | Asbirk S. |
| Year | 1979 |
| Title | The adaptive significance of the reproductive pattern in the Black Guillemot Cepphus grylle. Videnskabelige Meddelelser Dansk Naturhistorisk Forening 141: 29-80 |
| Authors(s) | Asbirk S. |
| Year | 1979 |
| Title | The adaptive significance of the reproductive pattern in the Black Guillemot Cepphus grylle. Videnskabelige Meddelelser Dansk Naturhistorisk Forening 141: 29-80 |