@Book{Seybold1968,
author  = "Seybold, Hans",
title   = "Über besondere Singularitäten in den Differentialgleichungen des Dreikörperproblems",
year    = "1968",
address = "München",
series  = "Sitzungsberichte",
volume  = "1967,7",
url     = "https://publikationen.badw.de/en/003384207",
}