@Book{Weinschenk1902,
author  = "Weinschenk, Ernst",
title   = "Zur Kenntniss der Graphitlagerstätten. Chemisch-geologische Studien. Die Graphitlagerstätten der Insel Ceylon",
year    = "1902",
address = "München",
series  = "Abhandlungen",
volume  = "Bd. 21, Abth. 2 = [3]",
url     = "https://publikationen.badw.de/de/006728694",
}