Джон Кэлхун проводит эксперимент с крысами
Yoichi R Okamoto, White House photographer <a rel="nofollow" class="external autonumber" href="https://clintonwhitehouse4.archives.gov/WH/kids/inside/html/fall99/html/farmer.html">[1]</a>
<p><a rel="nofollow" class="external free" href="http://www.pubmedcentral.nih.gov/picrender.fcgi?artid=1644264&amp;blobtype=pdf">http://www.pubmedcentral.nih.gov/picrender.fcgi?artid=1644264&amp;blobtype=pdf</a>. Work republished by NIH
</p>
Original source: John Calhoun "Death Squared: The Explosive Growth and Demise of a Mouse Population", 80 Proc. roy. Soc. Med. Volume 66January 1973 pp 80 - 88.