Erhard Hoffmann

发表

Chemical water and wastewater treatment IV : proceedings of the 7th Gothenburg Symposium 1996, September 23-25, 1996, Edinburgh, Scotland

Hermann H. Hahn, Erhard Hoffmann, Hallvard Ødegaard, 1996 .

Chemical water and wastewater treatment VIII : proceedings of the 11th Gothenburg Symposium 2004, 8-10 November, 2004, Orlando, Florida, USA

Hermann H. Hahn, Erhard Hoffmann, Hallvard Ødegaard, 2004 .

Handle with detection means

Gerhard Meixner, Axel Kuhnle, Erhard Hoffmann, 2004 .

Handle equipped with a detection device

Axel Kuhnle, Erhard Hoffmann, Gerhard Meixner, 2005 .

Chemical water and wastewater treatment VI : proceedings of the 9th Gothenburg Symposium 2000, October 02-04, 2000, Istanbul, Turkey

Hermann H. Hahn, Erhard Hoffmann, Hallvard Ødegaard, 2000 .

Chemical Water and Wastewater Treatment V: Proceedings of the 8th Gothenburg Symposium 1998 September 07-09, 1998 Prague, Czech Republic

Hermann H. Hahn, Erhard Hoffmann, Hallvard Ødegaard, 1989 .

Chemical Water and Wastewater Treatment VII

Erhard Hoffmann, Hallvard Ødegaard, Hermann H. Hahn, 2002 .

Meter with integrated manual

Erhard Hoffmann, Bjoern Haase, Uwe Skultety-Betz, 2002 .