Bleumer, Gerrit <br/><br/>
Electronic postage systems :  technology, security, economics / 
by Gerrit Bleumer 
 - Birkenwerder, Germany :  Springer,  2007 
 - 248 p. :  ill. ;  25 cm. 
 - Advances in information security ;  v. 26 .
<br/><br/><label>ISBN: </label>0387293132 9780387293134 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Postal service--Technological innovations<br/>Postal service--Data processing<br/>Computer security