TY  - RPRT
TI  - Methods of testing, rating and estimating the heating seasonal performance of heat pumps 
AU  - Parken, Walter H
AU  - Kelly, George E
AU  - Didion, David A
PY  - 1980
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS IR 80-2002
DO  - 10.6028/NBS.IR.80-2002
ER  -