"The Plague of the Working-Class: An Analytical Study in Steven Berkoff’s Greek" by Ahmed Rasheed Ibrahim and Nahidh Falih Sulaiman.
The study is described as focussing on "analyzing the play Greek (1980)... from a Marxist point of view. Berkoff himself was a Marxist during the period in which he wrote Greek, so Marxist themes are prevalent in his plays... The study concentrates on analyzing the Marxist identity of the characters of the play, and how it relates to their daily lives."
The study is in Arabic. Details are here
https://djhr.uodiyala.edu.iq/index.php/DJHR2022/article/view/3818
