@Book{Koenigsberger1892,
author  = "Koenigsberger, Leo",
title   = "Ueber die Irreductibilität der algebraischen partiellen Differentialgleichungssysteme",
year    = "1892",
address = "München",
series  = "Sitzungsberichte",
volume  = "1891,12",
url     = "https://publikationen.badw.de/en/003392697",
}