PHYSICS LETTERS B, vol. 572, no. 1-2, page. 81 - 90, 2003-10-16
PHYSICS LETTERS B, vol. 559, no. 1-2, page. 80 - 88, 2003-04-24
JOURNAL OF HIGH ENERGY PHYSICS, vol. 0301, no. 1, page. 26, 2003-01