31.03.2005
http://phyche.ac.ru/Events/Conferences/art6
/files/conf/Saratov 2005 .pdf
http://www.nature.com/cgi-taf/DynaPage.taf?file=/nature/journal/v434/n7033/abs/nature03428_fs.html
http://www.nature.com/cgi-taf/DynaPage.taf?file=/nature/journal/v434/n7033/abs/nature03429_fs.html
http://www.newscientist.com/article.ns?id=dn7208