@Book{Weber1901,
author  = "Weber, Eduard von",
title   = "Liniencomplexe im R4 und Systeme Pfaff'scher Gleichungen",
year    = "1901",
address = "München",
series  = "Sitzungsberichte",
volume  = "1900,17",
url     = "https://publikationen.badw.de/de/003384807",
}