REFERENCES
- Henderson (J T). The Foundation of Time and Frequency in Various Countries. Special Issue on Time and Frequency: Proc. IEEE. 60, 5; 1972; 489–492.
- “Time and Frequency Users' Manual”: NBS Technical Note 695, May, 1977.
- Becker (G), Fischer (B) & Hertel (P). Methoden zum Vergleich und zur Verbreitung von Zeitskalen (Methods for the comparison and dissemination of time scales). Kleinheubacher Berichte, 16, 5; 1973.
- Becker (G) & Hetzel (P). (1973) PTB-Jahresbericht 1972 (PTB Annual Report 1972), 107, Braunschweig.