Fair and equitable treatment/Minimum standard of treatment, including denial of justice claims
Full protection and security, or similar
http://globalarbitrationreview.com/news/article/30519/slovakia-defeats-intra-eu-claim/ (requires subscription)
http://globalarbitrationreview.com/news/article/30576/slovak-treaty-win-comes-price/ (requires subscription)
http://italaw.com/documents/OostergetelvSlovakRepublic.pdf