Heterocyclic Compounds 

 - New York :   John Wiley,  1951  
 - Polycyclic Five-, and Six-Membered Compounds containing One O or S Atom  2  .
<br/><br/><label>Standard No.: </label>DEX-M7008 
<br/><br/><label>Subjects--Topical Terms: </label><br/>HETEROCICLOS
<br/><br/><label>Universal Decimal Class. No.: </label>547.8