Dramatic monologe

Im loking for some theory about "Dramatic monologue"
I thought that Browning wrote some about it (any essay or introductory text) but I can not find it.
Anyone could help me, please? :yawnb:

http://www.poets.org/viewmedia.php/prmMID/5776

I found this link...its not by Browning, but it gives some information and lists some authors.

http://books.google.ca/books?id=Q5TK...snum=1#PPA8,M1
is a bit dry, but provides some decent criticism concerning Dramatic Monologues. The interesting thing about it is that it covers both contemporary use of dramatic monologues, as well as the use of the dramatic monologue during the Romantic era

Thank you