@Book{Steinheil1868,
author  = "Steinheil, Carl August",
title   = "Beitrag zur Geodäsie",
year    = "1868",
address = "München",
series  = "Sitzungsberichte",
volume  = "1868,2,20",
url     = "https://publikationen.badw.de/de/003393255",
}