@inproceedings{HartmannTaubertFriedrichetal.2005,
  author    = {Hartmann, J{\"u}rgen and Taubert, Dieter Richard and Friedrich, R. and Sperfeld, P. and Hollandt, J{\"o}rg},
  title     = {Long-Term Stability of the Spectral Responsivity of Filter Radiometers at the PTB},
  booktitle = {Proceedings of Tempmeko 2004},
  editor    = {Zvizdic, D.},
  address   = {Zagrep},
  pages     = {977 -- 982},
  year      = {2005},
  language  = {en}
}