[Rashputin]

Yes.

The the legitimate reasons for removing a Pope, what steps must precede the removal, what the process is, and so on along with every false rationale and line of reasoning rabbit hole Sedevacantists go down is spelled out in :

True of False Pope
Refuting Sedevacantism and Other Modern Errors
John Salza & Robert Siscoe
ISBN 978-1495181429

[ealgeone]

Yes. The the legitimate reasons for removing a Pope, what steps must precede the removal, what the process is, and so on along with every false rationale and line of reasoning rabbit hole Sedevacantists go down is spelled out in

There's even an article on sedevacantists as well.

http://canonlawmadeeasy.com/2017/04/20/can-you-be-both-a-catholic-and-a-sedevacantist/

These Roman Catholics are no longer in full communion with the Roman Catholic church per the article.