Shubin, M.A (ed) <br/><br/>
Partial differential equations VII  spectral theory of differential operators 
Ed by M.A. Shubin 
 - Berlin  Springer  1994 
 - 272 
 - Encyclopaedia of mathematical sciences 64 .
<br/><br/><label>ISBN: </label>3-540-54677-4 
<br/><br/><label>Dewey Class. No.: </label>4.04+5.03+10.02  / SHUB