How does fracking affect home and property values?

Below are a few links which discuss fracking's potential impact on home and property values:
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New Study Just Released: "Duke study: Fracking lowers home values by $30K"
Triangle Business Journal | DECEMBER 15, 2015
http://www.bizjournals.com/triangle/news/2015/12/15/duke-study-fracking-lowers-home-values-by-30.html

"Pollution Fears Crush Home Prices Near Fracking Wells"
Forbes Magazine | APRIL 10, 2014
http://www.forbes.com/sites/jeffmcmahon/2014/04/10/pollution-fears-crush-home-prices-near-fracking-wells/​

"Fracking: A Growing Threat to Home Values?"
DAILY REAL ESTATE NEWS | APRIL 22, 2014
http://realtormag.realtor.org/daily-news/2014/04/23/fracking-growing-threat-home-values

"‘Fracking’ Sparks Concern Over Nearby Home Values"
DAILY REAL ESTATE NEWS | DECEMBER 20, 2013
http://realtormag.realtor.org/daily-news/2013/12/20/fracking-sparks-concern-over-nearby-home-values

"Real Estate Value Impacts From Fracking"
ValueWalk | NOVEMBER 19, 2015 
http://www.valuewalk.com/2015/11/real-estate-va-from-fracking/

"Drilling vs. the American Dream: Fracking impacts on property rights and home values"
Resource Media | MARCH 14, 2014
http://www.resource-media.org/drilling-vs-the-american-dream-fracking-impacts-on-property-rights-and-home-values/#.VmrSlPkrK70

"A recent survey of 550 people found that the majority of people would not purchase a home near natural gas drilling. The University of Denver study, to soon be published in the Journal of Real Estate Literature, found up to a 25 percent decrease in bid value of homes near fracking. 

'There's a stigma,' Ron Throupe, one of the study's authors, told Reuters.​"