The logic of legal requirements :  essays on defeasibility / 
edited by Jordi Ferrer Beltrán, Giovanni Battista Ratti. 
 - Oxford :  Oxford University Press,  2012. 
 - viii, 421p. 
<br/><br/><label>ISBN: </label>9780199661640 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Law--Philosophy.
<br/><br/><label>Dewey Class. No.: </label>340.1