Fair and equitable treatment/Minimum standard of treatment, including denial of justice claims
Umbrella clause
https://www.iareporter.com/articles/investor-in-public-transportation-sector-makes-good-on-earlier-threat-to-bring-treaty-claim-against-serbia/ (requires subscription)
https://globalarbitrationreview.com/article/turkish-e-tickets-investor-brings-icsid-claim-against-serbia (requires subscription)