Petrovskii, Ivan Georgievich <br/><br/>
Lectures in partial differential equations 

 - New York:   Interscience publ.,   1954. 
 - 245 p.:   graf.;  
<br/><br/><label>Subjects--Topical Terms: </label><br/>ECUACIONES DIFERENCIALES PARCIALES<br/>CAUCHY PROBLEM<br/>LORENTZ TRANSFORMATIONS