TY  - RPRT
TI  - The geometry modeling system user's guide 
AU  - Clark, Stephen
AU  - Ressler, Sanford
PY  - 1987
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS IR 87-3508
DO  - 10.6028/NBS.IR.87-3508
ER  -