Titchmarsp, E C <br/><br/>
Eigenfunction expansions: associated with second-order differential equations 

 - 2nd ed. 
 - Oxford  Clarendon Press  1969 
 - 203 p. 
<br/><br/><label>ISBN: </label> PON7.5 
<br/><br/><label>Dewey Class. No.: </label>515.352 T531E