Ponchaud R D <br/><br/>
Light in action / 
R.D. Ponchaud. 
 - Slough :  University Tutorial Press,  1980. 
 - [6], 122 p. :  ill. ;  23 cm. 
<br/><br/><label>ISBN: </label>072310798X (pbk.) 
<br/><br/><label>LC Class. No.: </label>QD3102