Beckers, J. <br/><br/>
Invariance under conformal coordinate and point transformations 
/ J. Beckers and S. Sinzinkayo 
. - Amsterdam  : Elsevier Science Publications, 1984
. - pp. 371-383  ; 24 cm. 
<br/><br/> Extr. de : "Physica 126 A, 1984". 
<br/><br/><label>Source: </label> Dons Auteurs 
<br/><br/><label>Universal Decimal Class. No.: </label>538.3