TY  - BOOK
AU  - Amavis R Ed.
AU  -  Smeets J Ed.
ED  - European scientific colloquium (1975 : Luxembourg)
TI  - Proceeding on principles and methods for determining ecological criteria on hydrobiocensoses
U1  - G955p5,N75, L6 
PY  - 1976///
CY  - Oxford
PB  - Pergamon press        
KW  - Biology
ER  -