Liberzon, Daniel. <br/><br/>
Calculus of variations and optimal control theory :a concise introduction  a concise introduction 
Daniel Liberzon. 
 - Princeton, NJ :  Princeton University Press,  2012. 
 - p. cm. 
<br/><br/><label>ISBN: </label>9780691151878 (alk. paper) 
<br/><br/><label>LCCN: </label>2011935625