APPLIED PHYSICS LETTERS, vol. 100, no. 11, 2012-03-12
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE, vol. 209, no. 6, page. 1179 - 1183, 2012-06
ECS SOLID STATE LETTERS, vol. 1, no. 5, page. Q35 - Q38, 2012-08