Zapata-Rodríguez, Carlos J <br/><br/>
X-wave bullets with negative group velocity in vacuum.  [electronic resource] 

 -  Optics letters  Dec 2006 
 - 3532-4 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0146-9592 
<br/><br/><label>Standard No.: </label>10.1364/ol.31.003532  doi