@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}, type={Text}, title={Drei Beiträge zu einer allgemeinen Theorie der "Begriffe"}, URL={http://rcin.org.pl/ifis/Content/31404/PDF/WA004_2168_T4204_Erdmann-Drei-beitrag.pdf}, keywords={notions}, }