References
- FischerD., Lighting Research and Technology, Vol. 2, No. 3, 1970, p. 150.
- FischerD., Lichttechnik, Vol. 22 No. 2, 1970, p. 61 and No. 3 p. 103.
- BalderJ. J., Lichttechnik, Vol. 9, 1957, p. 455.
- CollinsJ. B. and PlantC. G. H., Lighting Research and Technology, Vol. 3, 1971, p. 219.
- FischerD., Lighting Research and Technology, Vol. 4, 1972, p. 97.