@Book{Sohncke1889,
author  = "Sohncke, Leonhard",
title   = "Beiträge zur Theorie der Luftelektricität",
year    = "1889",
address = "München",
series  = "Sitzungsberichte",
volume  = "1888,3",
url     = "https://publikationen.badw.de/en/003899159",
}