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C h e s w i c k, William R.-Firewalls and 
Internet Security. Repelling the Wily 
Hacker. William R. Cheswick, Steven M. 
Bellovin. [Mit graph. Darst.]-Reading, 
New York,Amsterdam [u.a.]: Addison-Wesley 
Pub!. Comp. (1994). XIV, 306 S. 8°