Try: <a href="http:&#x2F;&#x2F;genetics.med.harvard.edu&#x2F;reich&#x2F;Reich_Lab&#x2F;Publications_files&#x2F;2015_Nature_Skoglund_PopulationY_concatenated.pdf" rel="nofollow">http:&#x2F;&#x2F;genetics.med.harvard.edu&#x2F;reich&#x2F;Reich_Lab&#x2F;Publications...</a>