@Book{Korn1903,
author  = "Korn, Arthur",
title   = "Ueber den einfachsten semidefiniten Fall in der eigentlichen Variationsrechnung",
year    = "1903",
address = "München",
series  = "Sitzungsberichte",
volume  = "1902,6",
url     = "https://publikationen.badw.de/en/003388896",
}