Arbitrary, unreasonable and/or discriminatory measures
Full protection and security, or similar
Umbrella clause
http://globalarbitrationreview.com/news/article/34160/salini-takes-argentina/ (requires subscription)
https://www.iareporter.com/articles/in-new-award-arbitrators-uphold-jurisdiction-over-bit-claim-against-argentina-finding-that-the-claimant-has-made-a-prima-facie-case-that-the-respondents-failure-to-pay-monies-under-contract/ (requires subscription)