L.J. Mason; L.P. Hughston; P.Z. Kobak <br/><br/>
Further Advances in Twistor Theory  Volume II: Integrable Systems, Conformal Geometry and Gravitation 

 -  Taylor and Francis  1995 
<br/><br/><label>ISBN: </label>9780429332548 
<br/><br/><label>Source: </label>EBOOK