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| The IET is a world leading professional organisation sharing and advancing knowledge to promote science, engineering and technology across the world. |
| Sum rules for lossless antennas |
| M. Gustafsson |
| IET Microwaves, Antennas & Propagation(2010), 4(4):501 |
| http://dx.doi.org/10.1049/iet-map.2009.0083 |