References
- CohenS., “New are discharge lamps and ballasts—compatibilities and incompatibilities”, Lighting Design and Application, Vol. 6, No. 3, March 1976, p. 31.
- FreeseR. W., LekebuschR. C. and UlcickasP. W., “High-intensity metal arc discharge lamp”, U.S. Patent No. 3,900,761.