TY  - BOOK
AU  - Spekreijse,H.
AU  - Van Der Tweel,L.H.
TI  - Spatial contrast: report of a workshop held in Amsterdam, January 4-9, 1976 
SN  - 0720484391
PY  - 1977///
CY  - Amsterdam
PB  - North-Holland Publishing Company
KW  - Spatial systems
ER  -