%0 Electronic Article %X %@ 0013-5194 %T a polished blue %B Electronics Letters %D November 2016 %V 52 %N 24 %P 1971-1971 %I Institution of Engineering and Technology %U https://digital-library.theiet.org/;jsessionid=m9r3zbymqur6.x-iet-live-01content/journals/10.1049/el.2016.4002 %G EN