Rise and fall of Dell and Gold Key article?

[Gunnarsson, Joakim SE - HMJ]

Are there any good articles or texts on the subject of the rise and fall of
American Disney comics out there?
I'm thinking of the record sales in the 50's and how it all went down from
there, changing to Gold Key and Whitman and ending with low sales and
reprint upon reprint 3 packs in the mid 80's.
Are there any analysis on how and why it went so wrong? Why the sales
dropped etc. 
Any help or links would be greatly apprecciated.
Or you can mail me direct at joakim.gunnarsson (at) egmont.se

BTW: Posted some rare Murry art on my blog yesterday. Go check it out.
>From now on every Monday will be "Murry Monday" with unusual art. :-)

/Joakim. 
http://sekvenskonst.blogspot.com