Can someone give me resources to learn about the "Deklination ohne Artikel"?
There is for example this blog, but it doesn't help a lot:
It looks like you are referring to strong inflection / declension. There is a nice page on canoo.net about it. If your focus is on comparing it with the other declension types for adjectives, you might also want to check out:
Same noun, same case, same adjective, different ending – what are the rules behind this?
