The article mentions Chris Marker’s film on Tarkovsky, “One Day in the Life of Andrei Arsenevich” which I very much recommend, especially if you are a fan of both filmmakers. It contains a lot of behind the scenes footage from the filming of The Sacrifice, and is a deep and insightful appreciation of Tarkovsky’s contribution to cinema from an artist of comparable impact. There’s a copy on YouTube here:

https://m.youtube.com/watch?v=35lETmPDypI