@misc{Levi-Civita_Tullio_(1873–1941)_A_1949,
 author={Levi-Civita, Tullio (1873–1941)},
 editor={Dougall, John. Tł.},
 editor={Blackie & Son},
 copyright={Public Domain},
 address={London},
 address={Glasgow},
 howpublished={online},
 year={1949},
 publisher={Blackie & Son Limited},
 language={eng},
 title={A simplified presentation of Einstein's unified field equations},
 URL={http://www.rcin.org.pl/Content/80229/PDF/WA35_105202_3619brosz_Simplified_presentation.pdf},
}