TY  - BOOK
AU  - Norman, Robert Z.
AU  - Roberts, Fred S.
TI  - Notes on combinatorial mathematics: a derivation of a measure of relative balance for signed digraphs and a characterization of extensive ratio systems
U1  - RC 1970/572 
PY  - 1969///
CY  - California
PB  - Rand Corporation
KW  - Social structure
KW  - Sociology - Mathematical models
ER  -