LECTURE NOTES IN COMPUTER SCIENCE, vol. 5478, page. 791 - 795, 2009-04
LECTURE NOTES IN COMPUTER SCIENCE, vol. 5459/2009, page. 112 - 121, 2009-03
LECTURE NOTES IN COMPUTER SCIENCE, vol. 5478, page. 734 - 738, 2009-04
LECTURE NOTES IN COMPUTER SCIENCE, vol. 5459/2009, page. 225 - 235, 2009-03