PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE, vol. 204, no. 8, page. 2669 - 2674, 2007-08
MATERIALS SCIENCE FORUM, vol. 457-460, page. 363 - 366, 2004-01
PHYSICS OF THE SOLID STATE, vol. 47, no. 7, page. 1225 - 1232, 2005-01