@Book{Weinschenk1899,
author  = "Weinschenk, Ernst",
title   = "Zur Kenntniss der Graphitlagerstätten. Chemisch-geologische Studien",
year    = "1899",
address = "München",
series  = "Abhandlungen",
volume  = "Bd. 19, Abth. 2 = [5]",
url     = "https://publikationen.badw.de/en/003793429",
}