@Book{Bopp1965,
author  = "Bopp, Fritz",
title   = "Neue Methoden zur Quantisierung relativistischer Feldgleichungen",
year    = "1965",
address = "München",
series  = "Sitzungsberichte",
volume  = "1964,6",
url     = "https://publikationen.badw.de/de/003384133",
}