1. University of Bern, Physics Institute Sidlerstrasse,Bern,53012
2. ETH Zürich, Institute of Geodesy and Photogrammetry,Robert-Gnehm-Weg 15,Zurich,8093
3. Swiss Federal Institute of Technology in Lausanne (EPFL),Rte Cantonale,Lausanne,1015
4. Swiss Federal Institute of Technology in Lausanne (EPFL), School of Basic Sciences,Rte Cantonale,Lausanne,1015
5. University of Applied Sciences and Arts Western Switzerland Valais,Rue de l'Industrie 23,Sion,1950
6. Lucerne UAS, Inst. of Elect. Eng.,Horw,6048
7. HE-Arc Engineering,St-Imier,2610
8. University of Bern, Physics Institute,Bern,3012