http://www.enagas.es/stfls/ENAGAS/Relaci%C3%B3n%20con%20inversores/Arbitraje%20GSP%20espa%C3%B1ol.pdf
https://www.iareporter.com/articles/peru-sees-two-new-claims-at-icsid/ (requires subscription)
https://globalarbitrationreview.com/article/1171447/peru-faces-new-claim-over-pipeline-project-in-wake-of-odebrecht-scandal (requires subscription)
https://www.iareporter.com/articles/another-investor-files-notice-of-bit-claim-in-further-fallout-from-odebrecht-scandal/ (requires subscription)