@Book{Bopp1978,
author  = "Bopp, Fritz",
title   = "Ein-Teilchen-Masse bei Coulomb- und Spinorwechselwirkung",
year    = "1978",
address = "München",
series  = "Sitzungsberichte",
volume  = "1977,6",
url     = "https://publikationen.badw.de/en/003384279",
}