PHYSICA STATUS SOLIDI B-BASIC RESEARCH, vol. 241, no. 12, page. 2771 - 2774, 2004-10
PHYSICA STATUS SOLIDI B-BASIC RESEARCH, vol. 234, no. 3, page. 943 - 946, 2002-12
PHYSICA STATUS SOLIDI B-BASIC RESEARCH, vol. 240, no. 2, page. 451 - 454, 2003-11