The leap second: its history and possible future Nelson, R. A.; McCarthy, D. D.; Malys, S.; Levine, J.; Guinot, B.; Fliegel, H. F.; Beard, R. L.; Bartholomew, T. R. Abstract Publication: Metrologia Pub Date: December 2001 DOI: 10.1088/0026-1394/38/6/6 Bibcode: 2001Metro..38..509N