@Book{FreundHuckle1989,
author  = "Freund, Roland and Huckle, Thomas",
title   = "On hermitian block Toeplitz matrices and generalizations of the theorem of C. Carathéodory",
year    = "1989",
address = "München",
series  = "Sitzungsberichte",
volume  = "1988,3",
url     = "https://publikationen.badw.de/en/003572012",
}