Olav Rosef1*, Algimantas Paulauskas2, Nils Grude3, Camilla Haslekås1 and Andrew Jenkins3
1Telemark University College, Hallvard Eikas Plass 1, 3800 Bø i Telemark, Norway.
2Vytautas Magnus University, Kaunas, Lithuania.
3Unilabs Telelab AS, Skien, Norway.
