@misc{Jensen_Johan_(1892–1903)_Undersøgelser_1912,
 author={Jensen, Johan (1892–1903)},
 editor={Nielsen, Niels. Ed.},
 copyright={Public Domain},
 address={Kjøobenhavn},
 address={Kristiania},
 howpublished={online},
 year={1912},
 publisher={Gyldendalske Boghandel Nordisk Forlag},
 language={dan},
 title={Undersøgelser over Ligningernes Theori},
 type={Text},
 URL={http://www.rcin.org.pl/Content/79944/PDF/WA35_104605_4567_Beretning-5.pdf},
}