https://www.econstor.eu/bitstream/10419/145629/1/VfS_2016_pid_6540.pdf
 
https://gborjas.org/2016/09/21/nas3/
 
https://twitter.com/edwest/status/836513524407025664
 
http://www.unz.com/isteve/nyt-in-denmark-precision-parts-are-rotting-on-the-robotic-assembly-lines/
 
http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0050092