Thelen, A <br/><br/>
Optics in liechtenstein.  [electronic resource] 

 -  Applied optics  Dec 1976 
 - 2979-82 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>1559-128X 
<br/><br/><label>Standard No.: </label>10.1364/AO.15.002979  doi