Here are some articles you might like to read:

http://theartofphotography.tv/episod...-pulling-film/

http://www3.telus.net/drkrm/push-pull.htm

http://www.ilfordphoto.com/applications/page.asp?n=89

http://oldschoolphotolab.blogspot.nl...rocessing.html

http://markhancock.blogspot.nl/2004/...-and-pull.html