Avraham  Ebenstein, Fan, Maoyong , Greenstone, Michael , He, Guojun , and Zhou, Maigeng . 2017. ?New Evidence On The Impact Of Sustained Exposure To Air Pollution On Life Expectancy From China&Rsquo;S Huai River Policy?. Proceedings Of The National Academy Of Science, 114, 39, Pp. 10384-10389. http://www.pnas.org/content/114/39/10384.abstract.