scientific article published in July 2004

scientific article published in October 2017

scientific article published in July 2014

scientific article published in March 2004

scientific article published in May 2004

scientific article published in April 2009

scientific article published in November 2014

scientific article published in August 2020

scientific article published in March 2004

scientific article published in December 2013

scientific article published in October 2008

scientific article published in November 2007

scientific article published in June 2003

scientific article published in March 2009

report from the Committee for the Study of Digital Platforms, University of Chicago

scientific article published in May 2012

scientific article published in July 2005

scientific article published in June 2006

scientific article published in January 2010

scientific article published in September 2011

scientific article published in February 2006

scientific article published in July 2020

scientific article published in March 2016

scientific article published in January 2017