Question: Who published the prequel to Sphereland?

full_context: Document 1: Mathematical fiction: Mathematical fiction is a genre of creative fictional work in which mathematics and mathematicians play important roles. The form and the medium of the works are not important. The genre may include short stories, novels or plays; comic books; films, videos, or audios. One of the earliest, and much studied, work of this genre is , an 1884 satirical novella by the English schoolmaster Edwin Abbott Abbott. Mathematical fiction may have existed since ancient times, but it was recently rediscovered as a genre of literature; since then there has been a growing body of literature in this genre, and the genre has attracted a growing body of readers. For example, Abbot's Flatland spawned a sequel in the 21st century: a novel titled "Flatterland", authored by Ian Stewart and published in 2001.
Document 2: Flatland: Flatland: A Romance of Many Dimensions is a satirical novella by the English schoolmaster Edwin Abbott Abbott, first published in 1884 by Seeley & Co. of London.
Document 3: Garden Cities of To-morrow: Garden Cities of To-morrow is a book by the British urban planner Ebenezer Howard. When it was published in 1898, the book was titled "To-morrow: A Peaceful Path to Real Reform". In 1902 it was reprinted as "Garden Cities of To-Morrow". The book gave rise to the garden city movement.
Document 4: The Pilgrim's Progress: The Pilgrim's Progress from This World, to That Which Is to Come is a 1678 Christian allegory written by John Bunyan. It is regarded as one of the most significant works of religious English literature, has been translated into more than 200 languages, and has never been out of print. It has also been cited as the first novel written in English.
Document 5: De Selby: "De Selby" (spelled "de Selby" in "The Third Policeman" and "De Selby" in "The Dalkey Archive") is a fictional character originally created by Flann O'Brien for his novel "The Third Policeman" in which the nameless narrator intends to use the proceeds of murder and robbery to publish his commentaries on de Selby — a crackpot savant who theorizes, among other things, that the earth is actually shaped like a sausage.
Document 6: &quot;—And He Built a Crooked House—&quot;: <nowiki>'</nowiki>—And He Built a Crooked House—<nowiki>'</nowiki> is a science fiction short story by Robert A. Heinlein first published in "Astounding Science Fiction" in February 1941. It was reprinted in the anthology "Fantasia Mathematica" (Clifton Fadiman, ed.) in 1958 and in the Heinlein collection "The Unpleasant Profession of Jonathan Hoag" in 1959. The story is about a mathematically inclined architect named Quintus Teal who has what he thinks is a brilliant idea to save on real estate costs by building a house shaped like the unfolded net of a tesseract. The title is paraphrased from the nursery rhyme "There Was a Crooked Man".
Document 7: Discworld: Discworld is a comic fantasy book series written by the English author Terry Pratchett (1948–2015), set on the fictional Discworld, a flat disc balanced on the backs of four elephants which in turn stand on the back of a giant turtle, Great A'Tuin. The books frequently parody or take inspiration from J. R. R. Tolkien, Robert E. Howard, H. P. Lovecraft, Charles Dickens, and William Shakespeare, as well as mythology, folklore and fairy tales, often using them for satirical parallels with current cultural, political, and scientific issues. The series is popular, with more than 80 million books sold in 37 languages.
Document 8: Venus on the Half-Shell and Others: Venus on the Half-Shell and Others (ISBN  ) is a collection mostly of science fiction author Philip José Farmer's pseudonymous fictional-author literary works, edited by Christopher Paul Carey and published in 2008. Farmer describes a fictional-author story as "a tale supposedly written by an author who is a character in fiction." Carey, who had access to Farmer's correspondence while editing the book, reveals in his introduction that in the early to mid-1970s Farmer planned to edit an anthology of fictional-author stories by other writers. Farmer solicited fictional-author stories from authors such as Arthur Jean Cox, Philip K. Dick, Leslie Fiedler, Ron Goulart, Howard Waldrop, and Gene Wolfe, urging them to submit their stories to venues such as "The Magazine of Fantasy and Science Fiction". Only Cox, Waldrop, and Wolfe completed their stories and had them published, although Philip K. Dick's never realized fictional-author story "A Man for No Countries" as by Hawthorne Abendsen is said to have led Dick to write his posthumous novel "Radio Free Albemuth". In the end, Farmer's fictional-author anthology never materialized.
Document 9: Sphereland: Sphereland: A Fantasy About Curved Spaces and an Expanding Universe is a 1965 novel by Dionys Burger, and is a sequel to "Flatland", a novel by "A Square" (a pen name of Edwin Abbott Abbott). The novel expands upon the social and mathematical foundations on which "Flatland" is based. It is markedly different from the first novel in that it has a more prosaic ending and treatment of society.
Document 10: A Christmas Carol: A Christmas Carol in Prose, Being a Ghost-Story of Christmas, commonly known as A Christmas Carol, is a novella by Charles Dickens, first published in London by Chapman & Hall in 1843; the first edition was illustrated by John Leech. "A Christmas Carol" tells the story of Ebenezer Scrooge, an old miser who is visited by the ghost of his former business partner Jacob Marley and the Ghosts of Christmas Past, Present and Yet to Come. After their visits Scrooge is transformed into a kinder, gentler man.
Document 11: S. (Dorst novel): S. is a 2013 novel written by Doug Dorst and conceived by J. J. Abrams. The novel is unusual in its format, presented as a story within a story. It is composed of the novel "Ship of Theseus" by a fictional author, and hand-written notes filling the book's margins as a dialogue between two college students hoping to uncover the author's mysterious identity and the novel's secret plus loose supplementary materials tucked in between pages.
Document 12: Enderby Outside: Enderby Outside, first published in 1968 in London by William Heinemann, is the second volume in the Enderby series of comic novels by Anthony Burgess.
Document 13: Stalky &amp; Co.: Stalky & Co. is a novel by Rudyard Kipling about adolescent boys at a British boarding school. It is a collection of school stories whose juvenile protagonists display a know-it-all, cynical outlook on patriotism and authority. According to his family, Kipling enjoyed reading aloud stories from "Stalky & Co." to them and often went into spasms of laughter over his own jokes. It was first published in 1899 (following serialisation in the "Windsor Magazine"). Reflecting its origins, the novel is episodic in nature, with self-contained chapters. It is set at an unnamed school referred to as "the College" or "the Coll.", which is based on the United Services College in Devon, which Kipling attended. The character Beetle, one of the main trio, is partly based on Kipling himself, while the charismatic character Stalky is based on Lionel Dunsterville, M'Turk is based on George Charles Beresford, Mr King is based on William Carr Crofts, and the school Head, Mr. Bates, is based on Cormell Price.
Document 14: With Her in Ourland: With Her in Ourland: Sequel to Herland is a feminist novel written by Charlotte Perkins Gilman, and originally published in 1916 in Gilman's self-authored and edited periodical "The Forerunner". As its subtitle indicates, the book is the sequel to Perkins Gilman's "Herland", published in the previous year, 1915.
Document 15: The History of a Town: The History of a Town is a fictional chronicle by Mikhail Saltykov-Shchedrin first published in 1870 and regarded as the major satirical Russian novel of the 19th century. Originally it came out subtitled: "Based on true historical documents and published by M.E.Saltykov (Shchedrin)", implying the latter to be a publisher, not the author.
ground_truth: Seeley & Co.