Johns, M. W. <br/><br/>
Photoneutrons in a heavy water pile. 

 - Chalk River :  AECL,  1954. 
 - v. 32 p. 136-152 
<br/><br/><label>ISSN: </label>0067-0367 
<br/><br/><label>Standard No.: </label>AECL-90