Petkov, Petio Petrov,  <br/><br/>
Mathematical logic 
Petio Petrov Petkov  
 - 
 - Plenum Press, New York  1990 
 - 412 p 
 - .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematical logic-- Mathematics
<br/><br/><label>Dewey Class. No.: </label>511.3  PET-M