[tz] [PROPOSED] Use more up-to-date citation for leap seconds

[Paul Eggert]

* leapseconds.awk: Cite Levine 2016 instead of Quinn 1991.
---
 leapseconds.awk | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/leapseconds.awk b/leapseconds.awk
index 405ce3a..66eb64d 100644
--- a/leapseconds.awk
+++ b/leapseconds.awk
@@ -17,11 +17,9 @@ BEGIN {
   print "# The International Earth Rotation and Reference Systems Service"
   print "# periodically uses leap seconds to keep UTC to within 0.9 s of UT1"
   print "# (which measures the true angular orientation of the earth in space); see"
-  print "# Terry J Quinn, The BIPM and the accurate measure of time,"
-  print "# Proc IEEE 79, 7 (July 1991), 894-905 <http://dx.doi.org/10.1109/5.84965>,"
-  print "# reprinted in: Hackman C, Sullivan DB (eds), Time and frequency measurement,"
-  print "# American Association of Physics Teachers (1996),"
-  print "# <http://tf.nist.gov/general/pdf/1168.pdf>, 75-86."
+  print "# Levine J. Coordinated Universal Time and the leap second."
+  print "# URSI Radio Sci Bull. 2016;89(4):30-6. doi:10.23919/URSIRSB.2016.7909995"
+  print "# http://ieeexplore.ieee.org/document/7909995/"
   print "# There were no leap seconds before 1972, because the official mechanism"
   print "# accounting for the discrepancy between atomic time and the earth's rotation"
   print "# did not exist until the early 1970s."
-- 
2.7.4