@Book{Ebert1907,
author  = "Ebert, Hermann",
title   = "Über Pulsationen von geringer Periodendauer in der erdmagnetischen Feldkraft",
year    = "1907",
address = "München",
series  = "Sitzungsberichte",
volume  = "1906,14",
url     = "https://publikationen.badw.de/en/003388880",
}