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@article{ Thümmel2017,
 title = {Der trigonometrische Zirkel des Bürgers Richer: eine Episode aus der Geschichte der Navigation},
 author = {Thümmel, Ottfried},
 journal = {Deutsches Schiffahrtsarchiv},
 pages = {249-294},
 volume = {40},
 year = {2017},
 issn = {0343-3668},
 urn = {https://nbn-resolving.org/urn:nbn:de:0168-ssoar-83137-3},
}