TY  - BOOK
AU  - Welford, W. T.
AU  - Winston, Ronald
TI  - OPTICS OF NONIMAGING CONCENTRATORS
U1  - 621.47028 
PY  - 1978///
CY  - New York
PB  - Academic Press
KW  - Solar Collectors
N1  - References : P. 193-196
ER  -