Walters R F C. <br/><br/>
Categories  and computer science. 

 - ed. 
 - london :  cambridge press,  1991. 
 - 166  p. ;    cm. 
<br/><br/>index. 
<br/><br/><label>ISBN: </label> $ 
<br/><br/><label>Subjects--Topical Terms: </label><br/>computer science.