@Book{Pfaff1872,
author  = "Pfaff, Friedrich",
title   = "Beobachtungen über die Lateral-Refraction",
year    = "1872",
address = "München",
series  = "Sitzungsberichte",
volume  = "1872,14",
url     = "https://publikationen.badw.de/de/003392277",
}