Blair, Byron E. 1920-1982. Time and frequency: theory and fundamentals. Byron E. Blair, editor. - [Washington] U.S. National Bureau of Standards, 1974. - ix, 459 p. il. 27 cm. - NBS monograph ; . - NBS monograph ; 140. . Incluye bibliografía. Subjects--Topical Terms: TIME MEASUREMENTMEDIDA DE TIEMPO Subjects--Index Terms: Atomic frequency standards. Universal Decimal Class. No.: 531.76 Gov. Doc. Class. No.: C 13.44:140