Heterocyclic compounds  edited by Robert C. Elderfield. 

 - New York  John Wiley  1967 
 - vii, 462p. 23cm. 
<br/><br/>Contents:V.8 Tetrazoles tetrazines, and purines and related ring systems. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Chemistry, Organic.
<br/><br/><label>Dewey Class. No.: </label>547.59  / H59H