Serdiuk, Olexandr Vasiliovich, and Georgiy Viktorovich Grabchak. “Problematic Issues of Submitting of Counterclaims in International Centre for Settlement of Investment Disputes”. Problems of legality, no. 155 (December 20, 2021): 238–253. Accessed August 10, 2025. http://plaw.nlu.edu.ua/article/view/239558.