Fair and equitable treatment/Minimum standard of treatment, including denial of justice claims
Arbitrary, unreasonable and/or discriminatory measures
http://en.dzp.pl/deals-corner/deals-corner-archive/61-aktualnosci-prawne/1311-four-year-arbitration-case-settled-in-favour-of-republic-of-poland
http://msp.gov.pl/en/news/3625,Poland-will-not-pay-EUR-8-mln.html
https://www.iareporter.com/articles/in-heretofore-confidential-traco-v-poland-bit-award-veeder-chaired-tribunal-canvases-prescription-illegality-estoppel-objections-and-concurrent-causation/ (requires subscription)