Penning H J <br/><br/>
Boolean metric spaces 
Penning H J 
 -  1960 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>59017 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Boolean
<br/><br/><label>Dewey Class. No.: </label>B29M15, K0