Keitz, H. A. E. <br/><br/>
Light calculations and measurements :  an introduction to the system of quantities and units in light-technology and to photometry / 
by H. A. E. Keitz 
 - London :  Philips Technical Library,  1955 
 - 413 p. :  ill. ;  24 cm. 
 - Philips technical library. Series "Light and lighting," 7 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Photometry