Greiner, P. C.  1938- <br/><br/>
Eigenfunction expansions and scattering theory for perturbed elliptic partial differential operators. 

 - [1st ed.] 
 - Yale:  Yale University Press,  1964. 
 - 93 p. 
<br/><br/><label>Dewey Class. No.: </label>515.35  / G824e