Open Source Content Managment Systems comparison research

Dear all,
I am comparing Open Source Content Managment Systems inorder to select one as a case study in my research point , so I need some papers that talk about CMS architecture and compare between CMSs like (Drupal,Joomla ans wordpress) on architecture level.

Regards

For architecture? That's interesting. I hope you find a lot of useful suggestions here, but I don't think I have any. I'm not knowledgeable enough in your field.

However, I want to challenge you to reflect on your purpose. The PURPOSE is what it is all about. What problem are you solving? What benefit are you providing? What questions are you answering?

You can choose a case example according to the contribution you want to make!

OR make a contribution that can be made by analyzing the case example to which you have access.
Follow your interest. Have you found an article that appeals to you?