http://globalarbitrationreview.com/news/article/32081/repsol-reaches-tentative-agreement-argentina/ (requires subscription)
http://globalarbitrationreview.com/news/article/32456/repsol-settles-icsid-dispute-argentina/ (requires subscription)
http://www.iareporter.com/articles/20140430 (requires subscription)
http://www.iareporter.com/articles/20121205 (requires subscription)
https://books.google.ch/books?id=PyKXBQAAQBAJ&pg=PA354&lpg=PA354&dq=Repsol,+S.A.+and+Repsol+Butano,+S.A.+v.+Argentine+Republic+%28ICSID+Case+No.+ARB/12/38%29&source=bl&ots=x9im99OOVg&sig=iqoKs1PX8pSMxR2B2THtBf9g2Ok&hl=en&sa=X&ei=hNssVf2AL8uRsAGD_4PoBA&ved=0CEMQ6AEwBg#v=onepage&q=Repsol%2C%20S.A.%20and%20Repsol%20Butano%2C%20S.A.%20v.%20Argentine%20Republic%20(ICSID%20Case%20No.%20ARB%2F12%2F38)&f=false