Stein, J.C. <br/><br/>
The effect of vitamin A-acid on mulicellular spheroids. 

 - Karlsruhe :  KfK,  1994. 
 - 120 p. 
<br/><br/><label>ISSN: </label>0303-4003 
<br/><br/><label>Standard No.: </label>KfK 5308