Kille, Stephen E..  <br/><br/>
Implementing X.400 and X.500 :   the PP and QUIPU Systems /  
Kille Stephen E.. 
 - London :   Artech - House,   1991. 
 - XXXIII, 619 s.:   il.;   28 cm. 
<br/><br/><label>ISBN: </label>0890065640