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Acceptable Use Agreement
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https://www.caida.org/about/legal/aua/public_aua/

When referencing this data (as required by the AUA), please reference the
associated paper::

   IPv6 AS Relationships, Clique, and Congruence
   V. Giotsas, M. Luckie, B. Huffaker, and k. claffy
   in: Proc. PAM, Lecture Notes in Computer Science, Volume 8995, 2015, pp 111-122
   https://catalog.caida.org/details/paper/2015_ipv6_as_relationships     

Also, please, report your publication to CAIDA
(https://www.caida.org/catalog/datasets/publications/report-publication).