@Book{Haupt1983,
author  = "Haupt, Otto",
title   = "Zur Verallgemeinerung des Riemannschen Integrals",
year    = "1983",
address = "München",
series  = "Sitzungsberichte",
volume  = "1982,2",
url     = "https://publikationen.badw.de/de/000244850",
}