https://www.iareporter.com/arbitration-cases/enagas-v-peru-2/ (requires subscription)
https://www.iareporter.com/articles/spanish-gas-company-lodges-second-icsid-claim-against-peru/ (requires subscription)
https://ciarglobal.com/segundo-arbitraje-de-inversiones-de-enagas-contra-peru-en-ciadi/