Microwave and Optical Technology Letters
Microwave and Optical Technology Letters > 53 > 3 > 562 - 565
Microwave and Optical Technology Letters > 53 > 4 > 803 - 806
Microwave and Optical Technology Letters > 53 > 7 > 1505 - 1511
Microwave and Optical Technology Letters > 53 > 7 > 1472 - 1475