@Book{Sack1925,
author  = "Sack, Pius",
title   = "Die Zweiflügler des Urwaldes von Bialowies",
year    = "1925",
address = "München",
series  = "Abhandlungen",
volume  = "5,6",
url     = "https://publikationen.badw.de/de/039637254",
}