1. See decision of 25 Feb 1969, 31 BVerwGE 301, 304 where the Federal Administrative Court has characterized it as “the central concept of the administrative law and administrative procedure.”
2. Mayer O: Deutsches Verwaltungsrecht,vol i, 95 (1895).
3. This is implied in ss 37(4) and 39(2) of the Law of Administrative Procedure (VwVfG)
4. See decision of 12 Oct 1962, 15 BVerwGE 59 and 63.
5. Ule C: Verwaltungsprozeßrecht,146 (7th ed, 1978).