Linear differential and difference equations : 
Johnson, R. M. 
 - Chichester :  Albion Pub.,  1997 
 - 167 p. :  ill. ;  24 cm. 
<br/><br/> Rev. ed. of: Theory and applications of linear differential and difference equations. 1984. 
<br/><br/><label>ISBN: </label>1898563128