TY  - BOOK
AU  - Sylvester-Bradley, P. C.
TI  - The species concept in paleontology: : a symposium
T2  - The Systematics Association. Publication
U1  - 560 
PY  - 1956///
CY  - London
PB  - The Systematics Association
KW  - Especies
KW  - Paleontología
ER  -