Santos, J. <br/><br/>
CLASSIFICATION OF THE RICCI TENSOR IN 5-DIMENSIONAL SPACE-TIMES. 

 - Rio de Janeiro :  CBPF,  1993. 
 - 7 p. 
<br/><br/><label>ISSN: </label>0029-3865 
<br/><br/><label>Standard No.: </label>CBPF-NF-037-93