Welford, W. T. <br/><br/>
The optics of nonimaging consentrators :  Light and solar energy / 
W.T. Welford and R. Winston. 
 - New York :  Academic Press,  c1978. 
 - xi, 200 p. : ill. 
<br/><br/><label>ISBN: </label>0127453504 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Solar collectors.