Accessible Ads - any suggested resources?

Hello,

I'm working on putting together a plan/proposal for accessible Web ads with
my employer - both banners and text lists. At first glance this seams
straight forward - follow WCAG2 check points. Though, I suspect their may be
more to the structure and "politeness" of an accessible add than I can think
of on a whim.

Would anyone know of any studies/papers/blogs about accessible adds? I did a
preliminary search and came up with a few results but nothing really that
interesting/useful.

Regards
-peter