@book{
183-19440711X,
title = {Funktechnische Formelsammlung},
author = {Schmid, Otto and Leithiger, Max},
editor = {Leithiger, Max},
address = {Berlin},
publisher = {Weidmann},
year = {1939},
language = {German},
url = {https://katalog.fid-bbi.de/Record/183-19440711X}
}