TY  - BOOK
AU  - Kramer,K.U.
AU  - Green,P.S.
TI  - Pteridophytes and gymnosperms
SN  - 0387517944
PY  - 1990///
CY  - Berlin
PB  - Springer-Verlag
KW  - Pteridophyta
KW  - Classification
KW  - Gymnosperms
ER  -