Thomas Dalton wrote:
You can't make the real problem in an article go away by writing the letters "OR" on a post-it note, and sticking it on. That's being simplistic.
Some problems can't be solved. If there is no published research on a particular matter, it can't be included in a wikipedia article, however much it would add to that article.
We can do better than depend on such tautologies. Like other negative statements denying the existence of something, it is just as difficult to establish that adequate sources do not exist. Sometimes the research needs to be pulled together from a range of sources. If we find a statement to be inadequately sourced our first obligation should be to seek sources from one or more places. To use NOR as a bare tool to excuse the omission of information is a perversion of the basis for having that guideline in the first place.
Ec