A computable universe :  understanding and exploring nature as computation / 
editor: Hector Zenil ; foreword by Roger Penrose. 
 - Singapore :  World Scientific  2013. 
 - xliv, 810 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>9789814374293  RM590.60 9814374296 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computational complexity.