Django - How to query the Django Comments Framework

Django - How to query the Django Comments Framework

I'm using the Django Comments Framework.
I need to query all the comments of a certain Content Type. How can I do
that?
In the view I'm doing this query:
from django.contrib.comments.models import Comment
comments = Comment.objects.all().order_by('-submit_date')
Now, on the view how can I query the related object information(certain
Content Type)?
Any clues?
Best Regards,