| Authors(s) | Dyck, J. | 
| Year | 1990 | 
| Title | The way in which feather colours are produced and their potential for identification of feather remains. 20th Meeting Bird Strike Committee Europe (Helsinki). Working Paper 48: 543-548. | 
| Authors(s) | Dyck, J. | 
| Year | 1990 | 
| Title | The way in which feather colours are produced and their potential for identification of feather remains. 20th Meeting Bird Strike Committee Europe (Helsinki). Working Paper 48: 543-548. |