Helman, J.S. <br/><br/>
A SIMPLE MODEL FOR DRY FRICTION. 

 - Rio de Janeiro :  CBPF,  1993. 
 - 24 p. 
<br/><br/><label>ISSN: </label>0029-3865 
<br/><br/><label>Standard No.: </label>CBPF-NF-041-93