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Received: 15 October 1998
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Kersten, P., Mensing, F., Sterr, U. et al. A transportable optical calcium frequency standardDedicated to J. Helmcke on the occasion of his 60th birthday. . Appl Phys B 68, 27–38 (1999). https://doi.org/10.1007/s003400050582
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DOI: https://doi.org/10.1007/s003400050582