%0 Electronic Article %X %@ 0013-5194 %T in brief %B Electronics Letters %D December 2018 %V 54 %N 25 %P 1412-1412 %I Institution of Engineering and Technology %U https://digital-library.theiet.org/;jsessionid=64m3hhsr07s8j.x-iet-live-01content/journals/10.1049/el.2018.7741 %G EN