TY  - BOOK
AU  - Demuynck, M  .
AU  - Nyns,E.J  .
AU  - Palz,W  .
TI  - Biogas plants in Europe: A practical handbook, Vol.6 / 
U1  - 028.71621 
PY  - 1984///
CY  -  : 
PB  - D Reidel publishing company , 
ER  -