Bernstein, Dorothy Lewis,  1914- <br/><br/>
Existence theorems in partial differential equations/ 
by Dorothy Lewis Bernstein 
 - Princeton :  The University Press,  1950 
 - vii, 228 p. ;  26 cm. 
 - Annals of mathematics study ;  no.23 .
<br/><br/>Bibliography : p. 217-228 
<br/><br/><label>ISBN: </label> usd 2.50 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential equations, Partial<br/>Existence theorems