1. Some Characteristics of Glow-Discharge Voltage-Regulator Tubes;Titterton;J. Sci. Instrum.,1949
2. Voltage Stabilized Supplies;Benson,1957
3. Electrical Counting;Lewis,1942
4. Stabilizing Direct Voltage Supplies;Hughes;Wireless Engr.,1947
5. Stabilizing Direct Voltage Supplies;Leslie;Ibid.,1947