Besdo, Dieter <br/><br/>
Examples to extremum and variational principles in mechanics 

 - Wien  Springer - verlag  1973 
 - 236p. (International centre for mechanical sciences, ceurses and lectures,65) .
<br/><br/> "Course held at the Dept.of General Mechanics Oct.1970". 
<br/><br/><label>Universal Decimal Class. No.: </label>531:517.97(042.4)  / BES