1. Kanstad, S.O.: ‘Pulsating infrared radiation source’. Patent Cooperation Treaty (PCT)/90/00086, WO 90/14580, International Publication date: 29 Nov. 1990; USA Patent 5 220 173, 15 June 1993; European Patent EP 0 474 700, 31 July 1996
2. Hudson, R.D.: ‘Infrared system engineering’, (Wiley 1969), p. 69–71
3. A new concept for solar energy thermal conversion
4. Duley, W.W.: ‘CO2lasers, effects and applications’, (Academic Press 1976)