Lavrentiev, M. M. <br/><br/>
Some improperly posed problems of mathematical physics 
M. M. Lavrentiev; translated from Russian by Robert J. Sacker 
 - Berlin  Springer-Verlag  1967 
 - [viii], 72p.; 23cm.- 
 - Springer tracts in natural philosophy; no.11 .
<br/><br/><label>Dewey Class. No.: </label>530.155  / LAV