Gripenberg G. <br/><br/>
Volterra Integral and Functional Equations. 
Gripenberg G., Londen S.-O., Staffans O. 
 - Cambridge a.o.  Cambridge University Press  1990 
 - 723 p. 
<br/><br/> Encyclopedia of Mathematics and its Applications 
<br/><br/><label>Dewey Class. No.: </label>517.983