@misc{Pichler_Hans_(1877-1949)_Einführung,
 author={Pichler, Hans (1877-1949)},
 howpublished={online},
 publisher={Pan-Verlagsgesellschaft},
 language={ger},
 type={książka},
 title={Einführung in die Kategorienlehre},
 keywords={Kategorie (filozofia)},
}