Partial Differential Equations / 
Yu.V. Egorov, M.A. Shubin eds. ; Transl. M. Capinski eds. 
 - Berlin ;  New York :  Springer-Verlag,  1994. 
 - vol. 
 - Encyclopaedia of Mathematical Sciences  V. 63 .
<br/><br/> VI (1994, 326 p., bibliogr. p. 310-316) : 
<br/><br/>
<br/><br/><label>ISBN: </label>0387546782 (VI) 3540546782 (VI)