@Book{Landsberg1908,
author  = "Landsberg, Georg",
title   = "Zur Theorie der elliptischen Modulfunktionen",
year    = "1908",
address = "München",
series  = "Sitzungsberichte",
volume  = "1907,1.",
url     = "https://publikationen.badw.de/en/003388834",
}