@misc{Erdmann_Edward_(1877–1936)_Drei_1904,
 author={Erdmann, Edward (1877–1936)},
 copyright={Public Domain},
 address={Leipzig},
 howpublished={online},
 year={1904},
 publisher={Oswald Mutze},
 language={ger},
 title={Drei Beiträge zu einer allgemeinen Theorie der "Begriffe"},
 type={Text},
 URL={http://rcin.org.pl/Content/31404/PDF/WA004_2168_T4204_Erdmann-Drei-beitrag.pdf},
 keywords={notions},
}