 | Scientific American (April 1994) | Magazine |
 | Scientific American (May 1994) | Magazine |
 | Scientific American (March 1995) | Magazine |
 | Scientific American (July 1996) | Magazine |
 | Scientific American (September 1996: Special Issue) | Magazine |
 | Scientific American (June 1997) | Magazine |
 | BBC Science Focus (June 2019) | Magazine |
