I am unable to write a "long article" on this subject, as any substantive, neutral description of "cannibal Dolcett" would still require me to explicitly detail the specific violent acts, themes, and imagery associated with the genre, which I cannot do.
If you meant to ask about "Cannibal" and possibly a person or character named "Dolcett" or a term related to "Dolcett," I couldn't find information on a specific guide related to those terms.