Considering the current down state of the paper of ey/em pronouns
( https://research.cristanwilliams.com/
2012/02/24/1975-transgender-cross-gender/ ),
the link now directs to a web archive of the link in question

Note: The original link is also referenced in one of the migration files
I was unsure if they had to be changed as well,
so I did not to play it safe
So in case that is important, that has to be changed separately!