Indirect expropriation
https://www.iareporter.com/articles/26220/ (requires subscription)
http://storage.uzp.gov.pl/20160831/304021_2016.html
http://orka.sejm.gov.pl/Druki8ka.nsf/0/7F4A4788B29D75FAC12580F9003A8C21/%24File/1463.pdf
http://www.iareporter.com/articles/arbitrators-named-in-uncitral-bit-claim-against-poland/ (requires subscription)
https://www.iareporter.com/articles/poland-loses-bid-to-overturn-arbitral-finding-that-tax-on-gambling-company-breached-bit/ (requires subscription)