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SI brochure, Appendix 1, section 2.3
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CIPM, 1956, Resolution 1: definition of the unit of time (second)
Note: This definition was abrogated in 1967 (13th CGPM, Resolution 1, see below).
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11th CGPM, 1960, Resolution 9: definition of the unit of time (second)
Note: This definition was abrogated in 1967 (13th CGPM, Resolution 1, see below).
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12th CGPM, 1964, Resolution 5: atomic standard of frequency
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Declaration of the CIPM, 1964
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13th CGPM, 1967-1968, Resolution 1: SI unit of time (second)
Note: At its 1997 meeting, the CIPM affirmed that this definition refers to a caesium atom in its ground state at a thermodynamic temperature of 0 K.
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14th CGPM, 1971, Resolution 1: International Atomic Time, function of CIPM
Note: For the CIPM and CCDS (now the CCTF) recommendations concerning the definition of International Atomic Time, see Appendix 2.
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15th CGPM, 1975, Resolution 5: Coordinated Universal Time (UTC)
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