@Book{Heck2003,
author  = "Heck, Bernhard [Sonst.]",
title   = "National report of the Federal Republic of Germany on the geodetic activities in the years 1999 - 2003. XXIII general assembly of the International Union for Geodesy and Geophysics (IUGG) 2003 in Sapporo/Japan",
year    = "2003",
address = "München",
series  = "DGK: B (Angewandte Geodäsie)",
volume  = "Reihe B, Angewandte Geodäsie ; 312",
url     = "https://publikationen.badw.de/en/017394071",
}