@Book{Ehresmann1967,
author  = "Ehresmann, Dietbert",
title   = "Polynome minimaler Steigung und die Approximation durch Polynome",
year    = "1967",
address = "München",
series  = "Sitzungsberichte",
volume  = "1966,8",
url     = "https://publikationen.badw.de/de/003384183",
}