TY  - BOOK
AU  - Hanken, A. F. G.
AU  - Reuver,H.A.
TI  - Social systems and learning systems
T2  - Frontiers in systems research
SN  - 0898380502
U1  - 300 
PY  - 1981///
CY  - Boston
PB  - Martinus Nijhoff Publishing
ER  -