@Book{Lipps1899,
author  = "Lipps, Theodor",
title   = "Die Quantität in psychischen Gesammtvorgängen",
year    = "1899",
address = "München",
series  = "Sitzungsberichte",
volume  = "1899,1,6",
url     = "https://publikationen.badw.de/de/007458438",
}