@Book{Kowalsky1951,
author  = "Kowalsky, Hans-Joachim",
title   = "Differenzenquotienten in lokalkonvexen Vektorräumen",
year    = "1951",
address = "München",
series  = "Sitzungsberichte",
volume  = "1950,2.",
url     = "https://publikationen.badw.de/en/003383632",
}