@techreport{CAIA-TR-130930B,
    title = {{Collaborative Estimation of the Size of the Used IPv4 and IPv6 Address Spaces}},
    author = {Sebastian Zander and Lachlan L. H. Andrew and Grenville Armitage},
    month = {30 September},
    year = {2013},
    number = {130930B},
    address = {Melbourne, Australia},
    url = {http://caia.swin.edu.au/reports/130930B/CAIA-TR-130930B.pdf},
    institution = {Centre for Advanced Internet Architectures, Swinburne University of Technology}
}