PHYSICS IN MEDICINE AND BIOLOGY, vol. 47, no. 21, page. 3765 - 3769, 2002-11-07
OPTICAL ENGINEERING, vol. 41, no. 6, page. 1339 - 1345, 2002-06
APPLIED PHYSICS LETTERS, vol. 80, no. 15, page. 2634 - 2636, 2002-04-15