ERROR: The attribute ‘ref’ may not appear in tag ‘a’

Example URL:

https://validator.ampproject.org/#url=https%3A%2F%2Fwww.r-bloggers.com%2Fplotting-the-characteristic-roots-for-arima-models%2Famp%2F

Any chance you could add a filter to remove these automatically from the post’s content?

Thanks,
Tal