Although Sergei Kostin writes both non-fiction and espionage novels, he is not the same person as Sergei Kostin, the author of fantasy novels.
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Sergei Kostin is currently considered a "single author." If one or more works are by a distinct, homonymous authors, go ahead and split the author.
Sergei Kostin is composed of 3 names. You can examine and separate out names.