Back in the mid-1970's, author Philip Jose Farmer became such a fan of Kurt Vonnegut, Jr.'s fictional writer character Kilgore Trout that he actually wrote a novel using the Trout byline. The novel, Venus on the Half-Shell (referred to in Vonnegut's 1965 work, God Bless You, Mr. Rosewater), was published in 1975, but due to a falling-out between Farmer and Vonnegut, plans for further novels by Farmer using the Trout pseudonym were aborted. Furthermore, all reprintings of Venus had to credit Farmer as the sole author.
Farmer went on to write other novels and short stories as a "fictional author", often writing in the style of actual famous authors and/or as these authors' fictional characters. For example, Farmer's 1976 novel The Adventure of the Peerless Peer, a fictional team-up of Arthur Conan Doyle's Sherlock Holmes and Edgar Rice Burroughs's Tarzan of the Apes, set during the early days of World War One, is written (also tongue-in-cheek) in Conan Doyle's style (and credited, like Conan Doyle's Holmes stories, to Holmes' faithful partner "John H. Watson, M.D.", and "edited" by Farmer), while remaining essentially faithful to the established continuities of both fictional characters.