TY  - BOOK
AU  - Simon Herbert A
AU  - Ando Albert
ED  - Carnegie Institute of Technology. Graduate School of Industrial Administration
TI  - Aggregation of variables in dynamic systems
U1  - 658.10 
PY  - 1956///
PB  - O.N.R.Research Memorandum
KW  - Dynamic system
KW  - Management theory
ER  -