http://www.pewresearch.org/files/2015/08/FT_15.08.06_SexRatio_Map_2.png
http://www.pewresearch.org/fact-tank/2015/08/14/why-the-former-ussr-has-far-fewer-men-than-women/
http://www.pewresearch.org/fact-tank/2015/08/14/why-the-former-ussr-has-far-fewer-men-than-women/