Lavrentev, Mikhail Alekseevich, <br/><br/>
Variational methods for boundary value problems for systems of elliptic equations / 
by M.A. Lavrent'ev ; authorized translation from the Russian ; edited by J.R.M. Radok. 
 - Groningen :  P. Noordhoff,  1963. 
 - 150 p. : 
<br/><br/><label>ISBN: </label>627 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Calculus of variations.
<br/><br/><label>Dewey Class. No.: </label>515.64  / Va