TY  - RPRT
TI  - Recommended practice for measuring simple and discounted payback for investments in buildings and building systems 
AU  - Marshall, Harold E
PY  - 1984
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS IR 84-2850
DO  - 10.6028/NBS.IR.84-2850
ER  -