public transportation system and the extensive redevelopment of Amager, south of the main city. The bridge has not yet been as widely used by motorists as was originally hoped, likely due to the high road tolls, allegedly slowing the planned integration of the region. Train passengers, however, are plentiful and increasing in numbers. The lack of a commonly acceptable currency throughout the area is another hindrance to the integration of the region, even though a growing number of shops, restaurants etc., if not usually encouraged, accept payment with either nation's currency in the other country. In December 2009 Copenhagen hosted the worldwide climate meeting COP15. When US President Barack Obama participated in the end of this meeting it was the fourth time an American President had visited Copenhagen during his term (Obama also visited Copenhagen in October 2009, George W. Bush in 2005 and Bill Clinton in the 1990s). See also Timeline of Copenhagen References Notes Further reading Andersen, Hans Thor, and Lars Winther. "Crisis in the resurgent city? The rise of Copenhagen." International Journal of Urban and Regional Research 34.3 (2010): 693-700. Resurged in the mid-1990s with growth in jobs, income and population, based on a service- and knowledge-based economy Andersen, Hans Thor, Frank Hansen, and John Jørgensen. "The fall and rise of metropolitan government in Copenhagen." GeoJournal 58.1 (2002): 43-52. online Bayliss, Darrin. "The rise of the creative city: Culture and creativity in Copenhagen." European planning studies 15.7 (2007): 889-903. Birkelund, Palle. "The Royal Library of Copenhagen,"Library History Review (1974) 1#1 pp 83–96. Brock, Aske Laursen, and Jelle Van Lottum. "Rural maritime labour migration to Copenhagen and Stockholm (1700–1800)." Continuity and Change 34.2 (2019): 231-252. Coninck-Smith, Ning de. "Copenhagen Children's Lives and the Impact of Institutions, c. 1840–1920." History Workshop Journal 33#1 (1992), pp 57–72. focus on schools Dahlström, Hanna, Bjørn Poulsen, and Jesper Olsen. "From a port for traders to a town of merchants: exploring the topography, activities and dynamics of early medieval Copenhagen." Danish Journal of Archaeology 7.1 (2018): 69-116. Friedmann, Karen J. "Food Marketing in Copenhagen 1250-1850." Agricultural History 50.2 (1976): 400-413. online Glover, Gareth. The Two Battles of Copenhagen 1801 and 1807: Britain and Denmark in the Napoleonic Wars (2018) excerpt Gold, Carol. Women in Business in Early Modern Copenhagen 1740–1835 (2018) Gold, Carol. Educating Middle Class Daughters: Private Girls Schools in Copenhagen, 1790-1820 (1996), 243pp. Johansen, Hans Christian, and M. Phohl. "Danish banking