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year of pub­li­ca­ti­onISBNauthor(s)title
2004978-0-9759992-0-2Paul MahlerVoIP Telephony with Asterisk
  ''978-0-9759992-1-9Paul MahlerVoIP Telephony with Asterisk Book & Installation CD
2005978-0-9759992-2-6   ''VoIP Telephony with Asterisk: A systematic Approach to Learning the Open Source PBX