@book{id_13448,
author = "Sigl, Rudolf",
title = "Activity of the Special Study Group No. 22, linked to Section II of International Association of Geodesy 1967 - 1971",
year = "1971",
address = "München",
publisher = "Beck",
series = "DGK: Veröffentlichungen B: Angewandte Geodäsie",
volume = "190.",
}