EXPERT SYSTEMS WITH APPLICATIONS, vol. 28, no. 1, page. 149 - 161, 2005-01
ELECTRONIC COMMERCE RESEARCH AND APPLICATIONS, vol. 5, no. 3, page. 209 - 219, 2006-01
JOURNAL OF APPLIED PHYSICS, vol. 96, no. 9, page. 4742 - 4745, 2004-11-01
JOURNAL OF APPLIED PHYSICS, vol. 98, no. 4, 2005-08-15