@book{id_4073,
author = "Engi, Paul and Sigl, Rudolf and Wunderlin, Niklaus",
title = "Bestimmung der Längendifferenz Genf-München",
year = "1961",
address = "München",
publisher = "Bayer. Akad. d. Wiss.",
series = "Astronomisch-Geodätische Arbeiten",
volume = "21",
}