@Book{Szegö1927,
author  = "Szegö, Gábor",
title   = "Über den Grad der Approximation einer analytischen Funktion",
year    = "1927",
address = "München",
series  = "Sitzungsberichte",
volume  = "1927,6",
url     = "https://publikationen.badw.de/en/003390901",
}