@Book{Föppl1962,
author  = "Föppl, Ludwig",
title   = "Die Grundlagen der Elastizitätstheorie",
year    = "1962",
address = "München",
series  = "Sitzungsberichte",
volume  = "1961,7",
url     = "https://publikationen.badw.de/en/003384071",
}