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3. Durkin, J., Goodman, J., et al.: Building Multiservice Transport Networks (Networking Technology), Cisco Press; 1st end (2012)
4. Murakami, M., Li, H., Ryoo, J-d.: Packet Transport Networks: Overview and Future Direction, 2 nd APT/ITU Conformance and Interoperability Workshop (C&I-2) (2014). https://www.itu.int/en/ITU-T/C-I/interop/Documents/20140826/CI-2_INP-09_Packet_Transport_Networks_Overview_and_Future_Direction.pdf
5. Air Transport Network. https://en.wikipedia.org/wiki/Air_Transport_Network