MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, vol. 51, no. 12, page. 3011 - 3013, 2009-12
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, vol. 53, no. 10, page. 2207 - 2212, 2011-10
ELECTRONICS LETTERS, vol. 50, no. 3, page. 189 - 190, 2014-01-30