@misc{Hammer_Ernst_(1858–_)_Nullmeridian_1888,
 author={Hammer, Ernst (1858– )},
 copyright={Public Domain},
 address={Hamburg},
 howpublished={online},
 year={1888},
 publisher={J.F. Richter},
 language={ger},
 language={ger},
 title={Nullmeridian und Weltzeit},
 type={Text},
 URL={http://rcin.org.pl/Content/11191/PDF/WA35_27228_5535_Nullmeridian.pdf},
}