Dyson, Freeman J. <br/><br/>
Imagined worlds / 
Freeman J. Dyson. 
 - Cambridge ;  London :  Harvard University Press,  1997. 
 - 216 p. 
<br/><br/><label>ISBN: </label>0674539087 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science--History<br/>Science--Philosophy