@unpublished{TUW-119430, author = {Kahmen, Heribert}, title = {R{\"u}ckblick auf die Arbeiten der IAG Special Commission 4 on Application of Geodesy to Engineering 1999 - 2003}, year = {2003}, note = {talk: 23. IUGG General Assembly, Sapporo, Japan; 2003-06-30 -- 2003-07-11} }