https://www.youtube.com/watch?v=qrYY75DWA4M
http://ualresearchonline.arts.ac.uk/5461/1/Oberlack%2C_Ulrike_thesis.pdf
https://flockomania.com/2017/03/20/flockomania-2-2/
http://www.modernchinastudies.org/cn/issues/past-issues/93-mcs-2006-issue-3/975-2012-01-05-15-35-10.html