If someone finds a link that has translated versions of the poems used in Zerkalo, pleased share it. I could find only the russian version.
For those interested, here is a page that has some of Arseny Tarkovsky's poetry. He is the father of Andrei and his poems were used for the movie. I could spot two of them, the other two I do not remember. http://oldpoetry.com/oauthor/show/Arseny_Tarkovsky