Nature Materials, vol. 11, no. 7, page. 599 - 603, 2012-07
NANO LETTERS, vol. 10, no. 11, page. 4316 - 4320, 2010-11
APPLIED PHYSICS LETTERS, vol. 100, no. 6, page. 063501(1) - 063501(4), 2012-02-06