Plas, H. C. van der. <br/><br/>
Ring transformations of heterocycles / 
by H. C. Van Der Plas. 
 - London :  Academic Press,  1973. 
 - 2 v. ;  24 cm. 
 - Organic chemistry .
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>0127117016 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Heterocyclic compounds.<br/>Ring formation (chemistry).