Artemis Fowl: The Arctic Incident Easter Egg - The Bashkir Manuever

If you turn to Chapter 3: Going Underground, pages 48 and 49 in the original style, Butler will mention a false name: "How about Stefan Bashkir and his uncle Constantin?" It is apparently a well-used cover for them.

But this is also a reference to the leader in the Supernaturalists, another good read by Eoin Colfer.