- Perremans 1990a
- External surface structures of rachis, rami and rachidial barbules of feathers and their potential for determination purposes. 20th Meeting Bird Strike committee Europe Helsinki. Working Paper 3: 21-30.
- Perremans 1990b
- Rachidial structures of feathers and their potential use for determination purposes. 20th Meeting Bird Strike Committee Europe (Helsinki). Working Paper 5: 45.
- Prast 1994
- A computer based bird remains identification system. 22nd meeting Bird Strike Committee Europe (Vienna). Working Paper 92: 523-528.
- Prast 1996
- BRIS: a computer based Bird Remains Identification System. Further Developments. 23rd meeting Bird Strike Committee Europe (London). Working Paper 18: 197-201.