TY  - RPRT
TI  - Fractional factorial designs for experiments with factors at two and three levels 
AU  - Vaughan, R T
PY  - 1959
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS RPT 6504
DO  - 10.6028/NBS.RPT.6504
ER  -