2-Dimensional oxide electronic gases: Interfaces and surfaces M. Gabay, S. Gariglio, J.-M. Triscone and A.F. Santander-Syro Eur. Phys. J. Special Topics, 222 5 (2013) 1177-1183 Published online: 15 July 2013 DOI: 10.1140/epjst/e2013-01913-1