Today, Father Z has a critical article on the matter:
You may also wish to note this:
Preliminarily, I note that the burden is not on the negative to prove that something did not occur, it is on the affirmative to prove that the alleged something did occur. That said, though, it now seems all but certain that the ‘permission’ or ‘approval’ which Francis has claimed his predecessor Pope Paul VI gave for Congo nuns facing rape to use contraception simply does not exist.
That quote is by Canonist Edward Peters and can be found here:
Please spread the truth about this lie, propagated by the Pope himself far and wide and to every priest you know.
We have only just begin to resist!