Goursat, E <br/><br/>
Variation of solutions  partial differential equations of the 2nd order 
E. Goursat 
 - New York  Dover Publications  1964 
 - x  329 
 - Course in mathematical analysis Vol.3, pt.1 .
<br/><br/><label>Dewey Class. No.: </label>10.02  / GOUR