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  1. ... Link:  Provided by the SAO/NASA Astrophysics Data System Publication Date:  March, 1988 ...

    Anonymous - 2013-04-15 11:14

  2. ... Link:  Provided by the SAO/NASA Astrophysics Data System Publication Date:  May, 1989 ...

    Anonymous - 2013-04-15 11:09

  3. ... Link:  Provided by the SAO/NASA Astrophysics Data System Publication Date:  August, 2009 ...

    Anonymous - 2013-04-15 11:14

  4. ... Link:  Provided by the SAO/NASA Astrophysics Data System Publication Date:  September, 1994 ...

    Anonymous - 2013-04-15 11:09

  5. ... Link:  Provided by the SAO/NASA Astrophysics Data System Publication Date:  January, 2008 ...

    Anonymous - 2013-04-15 11:08

  6. ... Link:  Provided by the SAO/NASA Astrophysics Data System Publication Date:  December, 2011 ...

    Anonymous - 2013-04-15 11:11

  7. ... Link:  Provided by the SAO/NASA Astrophysics Data System Publication Date:  January, 1981 ...

    Anonymous - 2013-04-15 11:08

  8. ... Link:  Provided by the SAO/NASA Astrophysics Data System Publication Date:  May, 2012 ...

    Anonymous - 2013-04-15 11:14

  9. ... Link:  Provided by the SAO/NASA Astrophysics Data System Publication Date:  September, 2007 ...

    Anonymous - 2013-04-15 11:10

  10. ... Link:  Provided by the SAO/NASA Astrophysics Data System Publication Date:  March, 1976 ...

    Anonymous - 2013-04-15 11:08