%% You should probably cite draft-ietf-opsawg-pcapng instead of this I-D.
@techreport{tuexen-opsawg-pcapng-04,
    number =    {draft-tuexen-opsawg-pcapng-04},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-tuexen-opsawg-pcapng/04/},
    author =    {Michael Tüxen and Fulvio Risso and Jasper Bongertz and Gerald Combs and Guy Harris and Eelco Chaudron and Michael Richardson},
    title =     {{PCAP Next Generation (pcapng) Capture File Format}},
    pagetotal = 57,
    year =      2021,
    month =     oct,
    day =       4,
    abstract =  {This document describes a format to record captured packets to a file. This format is extensible; Wireshark can currently read and write it, and libpcap can currently read some pcapng files.},
}