TY  - BOOK
AU  - Pensa,Margus
TI  - Variation in needle retention of scots pine in relation to leaf morphology, nitrogen conservation and tree age
SN  - 9985-56-745-5
PY  - 2003///
CY  - Tartu
PB  - Tartu Univ. Press
KW  - Biology
KW  - Plant ecology
N1  - Includes bibliogr. references
ER  -