@Book{SchmidtEichhorn1970,
author  = "Schmidt, Hermann and Eichhorn, Wolfgang",
title   = "Über bilineare Additionstheoreme",
year    = "1970",
address = "München",
series  = "Sitzungsberichte",
volume  = "1969,3",
url     = "https://publikationen.badw.de/de/003454774",
}