@book{id_13217,
author = "Grafarend, Erik W. and Wolf, Helmut",
title = "Helmut Wolf",
year = "1998",
address = "München",
publisher = "Beck",
series = "DGK: Veröffentlichungen A: Theoretische Geodäsie",
volume = "115",
isbn = "3-7696-8196-7",
}