ATOMIC AND ASTRONOMICAL TIME

[1] Essen L, 1955, NATURE, V176, P280, DOI [DOI 10.1038/176280A0, 10.1038/176280a0]

[2] QUARTZ CLOCKS OF THE GREENWICH-TIME-SERVICE [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1953, 113 (01) : 67 - 80

[3] 1952, P S NPL, P99

[1] Essen L, 1955, NATURE, V176, P280, DOI [DOI 10.1038/176280A0, 10.1038/176280a0]

[2] QUARTZ CLOCKS OF THE GREENWICH-TIME-SERVICE [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1953, 113 (01) : 67 - 80

[3] 1952, P S NPL, P99