Porter, R W <br/><br/>
Does hard work prevent disc protrusion?  [electronic resource] 

 -  Clinical biomechanics (Bristol, Avon)  Nov 1987 
 - 196-8 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0268-0033 
<br/><br/><label>Standard No.: </label>10.1016/0268-0033(87)90081-7  doi