TY  - BOOK
AU  - Bertalanffy,Ludwig von
TI  - General system theory: foundations, development, applications 
SN  - 807604534
U1  - 001.53 
PY  - 1969///
CY  - New York : 
PB  - G. Braziller, 
KW  - System theory
KW  - Unified field theories
ER  -