@Book{Perron1924,
author  = "Perron, Oskar",
title   = "Bestimmung aller geradlinigen rhombischen Netze",
year    = "1924",
address = "München",
series  = "Sitzungsberichte",
volume  = "1924,[16]",
url     = "https://publikationen.badw.de/en/003390833",
}