Velo, Giorgio <br/><br/>
Invariant wave equations; proceedings of the "Ettore Majorana" international school of Mathematical physics held in Erice from June <27=twentyseven>th to July <9=nine>th, <1977=one thousand nine hundred seventyseven> 

 - Berlin  Springer-Verlag  1978 
 - 416p 
 -  Lecture notes in physics. <73=seventythree>  Ehlers, J  Hepp, K  Kippenhahn, R  Weidenmuller, H.A  Zittartz, J .
<br/><br/><label>Universal Decimal Class. No.: </label>53  / : 517.9 VEL.78