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Sources

• Singer, Jay Sean and Carl A. Pinter. Personal Interview. March 17, 2006.
• United States Patent Office. Patent 5,638, 832: Programmable subcutaneous visible implant, June 7, 1995.
  http://patft.uspto.gov/netacgi/nph-Parser?Sect2=PTO1&Sect2=
  HITOFF&p=1&u=%2Fnetahtml%2Fsearch-bool.html&r=1&f=G&l=50&d=
  PALL&RefSrch=yes&Query=PN%2F5638832