The Merck Manual - Sec. 15, Ch. 186 - Offers a layman's descritption of the condition. - http://www.merck.com/pubs/mmanual/section15/chapter186/186a.htm
Somatoform Disorders - Psyweb.com offers a general definition of this disorder. Includes details on the various types. - http://www.psyweb.com/Mdisord/somatd.html
Somatoform Disorder and Implicit Memory Bias (Ott et al, 2000) - Summary of a poster presentation examining experiments comparing two sets of individuals, one set with the disorder and the second being a healthy control group. - http://www.gwdg.de/~bbandel/gjp-poster-ott.htm