such as K. A. Applegate, C. J. Cherryh, P. N. Elrod, D. C. Fontana, S. E. Hinton, G. A. Riplinger, J. D. Robb, and J. K. Rowling. Alternatively, they may use a unisex pen name, such as Robin Hobb (the second pen name of novelist Margaret Astrid Lindholm Ogden). Collective names A collective name, also known as a house name, is sometimes used with series fiction published under one pen name even though more than one author may have contributed to the series. In some cases the first books in the series were written by one writer, but subsequent books were written by ghostwriters. For instance, many of the later books in The Saint adventure series were not written by Leslie Charteris, the series' originator. Similarly, Nancy Drew mystery books are published as though they were written by Carolyn Keene, The Hardy Boys books are published as the work of Franklin W. Dixon, and The Bobbsey Twins series are credited to Laura Lee Hope, although numerous authors have been involved in each series. Erin Hunter, author of the Warriors novel series, is actually a collective pen name used by authors Kate Cary, Cherith Baldry, Tui T. Sutherland, and the editor Victoria Holmes. Collaborative authors may also have their works published under a single pen name. Frederic Dannay and Manfred B. Lee published their mystery novels and stories under the pen name Ellery Queen, as well as publishing the work of ghostwriters under the same name. The writers of Atlanta Nights, a deliberately bad book intended to embarrass the publishing firm PublishAmerica, used the pen name Travis Tea. Additionally, the credited author of The Expanse, James S.A. Corey, is an amalgam of the middle names of collaborating writers Daniel Abraham and Ty Franck respectively, while S.A. are the initials of Abraham's daughter. Sometimes multiple authors will write related books under the same pseudonym; examples include T. H. Lain in fiction. The Australian fiction collaborators who write under the pen name Alice Campion are a group of women who have so far written The Painted Sky (2015), Der Bunte Himmel (2015), and The Shifting Light (2017). In the 1780s, The Federalist Papers were written under the pseudonym "Publius" by Alexander Hamilton, James Madison, and John Jay. The three men chose the name "Publius" because it recalled the founder of the Roman Republic and using it implied a positive intention. In pure mathematics,