Morse, Marston. <br/><br/>
Variational analysis  critical extremals and sturmian extensions 
by Marston Morse 
 - New York  Wiley-Interscience Publications  1973 
 - xi, 260p. 
 - Pure and Applied Mathematics .
<br/><br/><label>ISBN: </label>0471617008 
<br/><br/><label>Dewey Class. No.: </label>515.64  / N73