TY  - RPRT
TI  - Emergency vehicle warning systems 
AU  - Rubin, Arthur I
AU  - Howett, Gerald L
PY  - 1981
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS SP 480-37
DO  - 10.6028/NBS.SP.480-37
ER  -