@Book{Pringsheim1918,
author  = "Pringsheim, Alfred",
title   = "Zur Theorie der unendlichen Kettenbrüche",
year    = "1918",
address = "München",
series  = "Sitzungsberichte",
volume  = "1918,3",
url     = "https://publikationen.badw.de/en/003399162",
}