http://www.energycharter.org/what-we-do/dispute-settlement/investment-dispute-settlement-cases/37-evn-ag-v-republic-of-bulgaria/
http://www.iareporter.com/articles/20131212_1 (requires subscription)
http://www.dgap.de/dgap/News/corporate/evn-evn-commences-investment-treaty-arbitration-against-the-republic-bulgaria/?companyID=288&newsID=760663
http://globalarbitrationreview.com/news/article/31721/evn-files-icsid-claim-against-bulgaria/ (requires subscription)
http://globalarbitrationreview.com/news/article/18500/evn-finds-warranty-claims-fail-germinate/ (requires subscription)
https://globalarbitrationreview.com/article/1190201/bulgaria-sees-off-intra-eu-claim (requires subscription)
https://www.iareporter.com/articles/tribunal-members-diverge-in-final-ruling-in-intra-eu-ect-arbitration-against-bulgaria/ (requires subscription)
https://www.evn.at/EVN-Group/Investor-Relations/Ad-Hoc-Mitteilungen/Schiedsverfahren-Bulgarien.aspx?ru=%2fEVN-Group%2fMedien.aspx%3fps%3d50%26p%3d1
https://www.minfin.bg/bg/news/10662