http://www.iareporter.com/articles/bulgaria-is-hit-with-energy-related-icsid-claim-by-energo-pro-a-s/ (requires subscription)
http://www.energycharter.org/what-we-do/dispute-settlement/investment-dispute-settlement-cases/82-energo-pro-as-v-bulgaria/
http://globalarbitrationreview.com/news/article/33870/kosovo-faces-first-icsid-claim/ (requires subscription)
https://www.iareporter.com/articles/bulgaria-energy-pricing-dispute-concludes-with-an-award/ (requires subscription)