Calderón Valle, Roberto Daniel, <br/><br/>
El copo de nieve :  30 paradojas matemáticas / 
Daniel Calderón. 
 - 1 online resource :  illustrations. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematical recreations.
<br/><br/><label>LC Class. No.: </label>QA95 ebook