Simpson, J. C. E. <br/><br/>
Condensed pyridazine and pyrazine rings  J. C. E. Simpson. 

 - New York  Interscience Publishers  1953 
 - xvi, 394 p.: ill. 24 cm. 
<br/><br/><label>Dewey Class. No.: </label>547.7  / S47C