[1] RFC 1357 - A Format for E-mailing Bibliographic Records, 2021-02-01T01:05:26.000Z, 2021-03-13T09:57:25.986Z https://tools.ietf.org/html/rfc1357

[2] RFC 1807 - A Format for Bibliographic Records, 2021-01-24T13:06:15.000Z, 2021-03-13T09:57:33.767Z https://tools.ietf.org/html/rfc1807