Most of Denmarks's major publishing houses are based in Copenhagen. These include the book publishers Gyldendal and Akademisk Forlag and newspaper publishers Berlingske and Politiken (the latter also publishing books). Many of the most important contributors to Danish literature such as Hans Christian Andersen (1805–1875) with his fairy tales, the philosopher Søren Kierkegaard (1813–1855) and playwright Ludvig Holberg (1684–1754) spent much of their lives in Copenhagen. Novels set in Copenhagen include ''Baby'' (1973) by Kirsten Thorup, ''The Copenhagen Connection'' (1982) by Barbara Mertz, ''Number the Stars'' (1989) by Lois Lowry, ''Miss Smilla's Feeling for Snow'' (1992) and ''Borderliners'' (1993) by Peter Høeg, ''Music and Silence'' (1999) by Rose Tremain, ''The Danish Girl'' (2000) by David Ebershoff, and ''Sharpe's Prey'' (2001) by Bernard Cornwell. Michael Frayn's 1998 play ''Copenhagen'' about the meeting between the physicists Niels Bohr and Werner Heisenberg in 1941 is also set in the city. On 15–18 August 1973, an oral literature conference took place in Copenhagen as part of the 9th International Congress of Anthropological and Ethnological Sciences.