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Huggard, P. G. and Meyringer, M. and Schilz, A. and Goller, K. and Prettl, Wilhelm (1994) Far-infrared bandpass filters from perforated metal screens. Applied Optics 33 (1), pp. 39-41.
Huggard, P. G. and Meyringer, M. and Schilz, A. and Prettl, Wilhelm (1993) Rugged far infrared bandpass filters. In: Birch, James R. and Parker, Terence J., (eds.) Conference digest: Eighteenth International Conference on Infrared and Millimeter Waves, 6 - 10 September 1993 University of Essex, Colchester, United Kingdom. SPIE proceedings series, 2104. SPIE, Bellingham, Washington, p. 351. ISBN 0-8194-1392-5.