Smirnov. M.M. <br/><br/>
Second- order partial differential equations / 
M.M. Smirnov 
 - Groningen p :  Noordhoff,  c1966 
 - 192p.  
<br/><br/>Includes illus. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Equations, Theory
<br/><br/><label>Dewey Class. No.: </label>517.38 SMS