@Book{Messerschmitt1906,
author  = "Messerschmitt, Johann Baptist",
title   = "Magnetische Ortsbestimmungen in Bayern",
year    = "1906",
address = "München",
series  = "Sitzungsberichte",
volume  = "1905,5",
url     = "https://publikationen.badw.de/de/020106274",
}