@Book{Selder1965,
author  = "Selder, Helmut",
title   = "Über singuläre Stellen in den Differentialgleichungen des Dreikörperproblems",
year    = "1965",
address = "München",
series  = "Sitzungsberichte",
volume  = "1964,2",
url     = "https://publikationen.badw.de/de/003384125",
}