TY  - BOOK
AU  - Heywood, V.H.
TI  - Taxonomy and ecology : proceedings of an International Symposium held at the Department of Botany, University of Reading
T2  - The systematics association 
SN  - 0123469600
U1  - 582 
PY  - 1973///
CY  - London
PB  - Academic Press
ER  -