TY  - BOOK
AU  - Daal, J. Van
AU  - Merkies, A. H. Q. M.
TI  - Aggregation in economic research from individual to macro relations
T2  - Theory and Decision Library 
U1  - 339.31 
PY  - 1984///
CY  - Dordrecht
PB  - Reidel Publications
ER  -