TY  - BOOK
AU  - Downing J A Ed.
AU  -  Rigler F H Ed.
TI  - Manual of methods for the assessment of secondary productivity in fresh waters
U1  - K1:(G9557), M4 
PY  - 1984///
CY  - Oxford
PB  - Blackwell Scientific Pub       
KW  -  Invertebrata
KW  - Zoology
ER  -