United States of America
http://globalarbitrationreview.com/news/article/19630/georgia-faces-no-extra-claims-itera-case/ (requires subscription)
http://globalarbitrationreview.com/news/article/14652/itera-takes-georgia-icsid/ (requires subscription)
http://www.iisd.org/itn/2010/01/12/an-icsid-tribunal-splits-over-whether-to-hear-ancillary-claims-in-dispute-over-unpaid-gas-deliveries/