@Book{Pringsheim1897,
author  = "Pringsheim, Alfred",
title   = "Elementare Theorie der unendlichen Doppelreihen",
year    = "1897",
address = "München",
series  = "Sitzungsberichte",
volume  = "1897,3",
url     = "https://publikationen.badw.de/de/003391764",
}