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K. Kilkki: An Introduction to Communications Ecosystems
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is available at Amazon.com or Amazon.de. Price is only US$ 24 (or 21€).

Chapters available here in pdf format:

  Introduction (I)
  Human Benefit (H)
  User Behavior (U)
  Technology and Networks (T)
  Management and Control (M)
  Analysis and Science (A)
  Customer Satisfaction (C)
  Economics and Business (E)
  Systems and Society (S)
  Glossary and Index (G)

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K. Kilkki: Differentiated Services for the Internet
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is available here in pdf format:

  Contents
  Introduction
  Chapter 1, The Target of Differentiated Services
  Chapter 2, Traffic Management Before Differentiated Services
  Chapter 3, Differentiated Services Working Group
  Chapter 4, General Framework for Differentiated Services
  Chapter 5, Differentiation of Customer Service
  Chapter 6, Traffic Handling and Network Management
  Chapter 7, Per-Hop Behavior Groups
  Chapter 8, Interworking Issues
  Chapter 9, Implementing Differentiated Services
  Glossary
  Bibliography