1. IETF: RFC 1034 Domain names – concepts and facilities, Internet standard, November 1987
2. IETF: RFC 1035 Domain names - Implementation and specification - Internet standard, November 1987
3. Pure Hacking: Reverse DNS Tunneling – Staged Loading Shellcode, Ty Miller, Blackhat (2008)
4. Ayaya: Black Ops of DNS, Dan Kaminsky, Blackhat (2004)
5. OzymanDNS – Dan Kaminsky (2004).
https://dankaminsky.com/2004/07/29/51/