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WikiPedia: Jam_atom http://www.franklinclock.com/faq.htm http://books.google.com/books?id=naXkAAAAMAAJ&pg=P... http://www.ptb.de http://jilawww.colorado.edu/YeLabs/pubs/scienceArt... http://www.boulder.nist.gov/timefreq/service/its.h... http://tf.nist.gov/general/pdf/2039.pdf http://tf.nist.gov/timefreq/general/pdf/1485.pdf http://tf.nist.gov/timefreq/ofm/smallclock/index.h... http://www.nsf.gov/discoveries/disc_summ.jsp?org=D... http://tycho.usno.navy.mil/