Hans, Freudenthal <br/><br/>
Mathematics observed 

 - London  World University Library  1967 
 - 255 p. 
<br/><br/><label>ISBN: </label>249191 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics
<br/><br/><label>Dewey Class. No.: </label>510  / FRE