https://editorialexpress.com/cgi-bin/conference/download.cgi?db_name=SED2010&paper_id=111
http://people.bu.edu/fgourio/lecturenotes741Fall2006.pdf
http://bertha.tepper.cmu.edu/telmerc/phd_07/palgrave.pdf
http://repository.cmu.edu/cgi/viewcontent.cgi?article=1414&context=tepper
