@Book{Szász1927,
author  = "Szász, Otto",
title   = "Elementare Extremalprobleme über nichtnegative trigonometrische Polynome",
year    = "1927",
address = "München",
series  = "Sitzungsberichte",
volume  = "1927,14",
url     = "https://publikationen.badw.de/en/003390917",
}