TY  - RPRT
TI  - Minimum life cycle cost heat losses for shallow trench underground heat distribution systems 
AU  - Fang, Jin B
PY  - 1986
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS IR 86-3381
DO  - 10.6028/NBS.IR.86-3381
ER  -