Deletion of Ring singularity

Comment: A  style GScholar search shows hundreds of paper,s spanning half a century, discussing various aspects ring singularities. A Gbooks search shows that ring singularities are discussed in some depth in general relativity textbooks such as https://books.google.com/books?id=9S-hzg6-moYC&pg=PA315&dq=%22Ring+singularity%22+-wikipedia&hl=en&sa=X&ved=0ahUKEwi7w7PSl5LQAhXly1QKHeQRBlgQ6AEIGzAA#v=onepage&q=%22Ring%20singularity%22%20-wikipedia&f=false Wald's book and https://books.google.com/books?id=5dryXCWR7EIC&pg=PA324&dq=%22Ring+singularity%22+-wikipedia&hl=en&sa=X&ved=0ahUKEwi7w7PSl5LQAhXly1QKHeQRBlgQ6AEIQjAH#v=onepage&q=%22Ring%20singularity%22%20-wikipedia&f=false and the book by Hobson, et. al.. The topic looks solidly notable. The article could use better referencing, but this is a matter of editing, not deletion. A notable topic and an article with no major structural problems suggests keeping the article
Stance: keep
Cited policy: Wikipedia:Articles for deletion (WP:BEFORE)