* Gerald D Weinstein, Jerry L McCullough ja Priscilla Ross, [http://www.nature.com/jid/journal/v82/n6/full/5614840a.html Cell Proliferation in Normal Epidermis], Journal of Investigative Dermatology (1984) 82, 623–628; doi:10.1111/1523-1747.ep12261462, veebiversioon (vaadatud 10.01.2015.a.)<small>(''inglise keeles'')</small>