Ioffe, A.D & Tihomirov, V.M <br/><br/>
Theory of external problems 
A.D. Ioffe & V.M. Tihomirov 
 - Amsterdam  North-Holland Pub. Co.  1979 
 - xii  460 
 - Studies in mathematics & its applications 6 .
<br/><br/><label>ISBN: </label>044851674 
<br/><br/><label>Dewey Class. No.: </label>4.13+5.07  / IOFF