Bird Remains Identification System: 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.

Authors(s)	Perremans, K.
Year	1990a
Title	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.