Question: What is the name of the author who wrote a series of two science fiction novels, about beings who have taken on the roles of the Greek gods, which makes references to a novel written by a Russian author known by the pen name Vladimir Sirin?
Sentence (from "Devil to the Belt"): They are set in Cherryh's Alliance-Union universe and are prequels to her Hugo Award–winning 1981 novel "Downbelow Station".
Relevant evidence: No