thanks a lot for your module.
sorry for my english.
i am not an expert and i maybe what i ask as a feature is already possible.
i have search a lot and not find a explanation neither.
also in the irc.

i have a magazine with articles in an nodereference.
i have view to select the articles.
i would like to be able to select the articles that have not been referenced by other older magazine.
so, i hope is a good idea for you and implement or that sombody explains, please, howto.
thanks