Deletion of Spelling of disc

Comment: to the top of disc. I have added a further source and cleaned out, probably unsourceable, speculation. It will now fit at the top of ''disc'' which would clarify why that page has alternate spelling. No objection to a straight ''keep'', either, since it now has multiple, non-trivial sources per 
Stance: merge
Cited policy: Wikipedia:Notability (WP:N)

Comment: Since  is an argument to avoid, lets go with this: the article is derived from multiple non-trivial publications.  And its interesting
Stance: keep
Cited policy: Wikipedia:Arguments to avoid in deletion discussions (WP:INTERESTING)