TY  - RPRT
TI  - Testing for the impact resistance of ophthalmic lenses 
AU  - Berger, Robert E
PY  - 1976
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS IR 76-996
DO  - 10.6028/NBS.IR.76-996
ER  -