1. Human Development Report (UN Development Programme, New York, 2004);
http://hdr.undp.org/reports/global/2004
.
2. Science Watch 14, (2003);
http://www.sciencewatch.com/nov-dec2003/sw_nov-dec2003_page1.htm
.
3. Butler, D. Nature 422, 101–102 (2003).