Paul Anthony Haigh Andrew Burton Petr Chvojka Stanislav Zvanovec Zabih Ghassemlooy Izzat Darwazeh Visible Light Communications: Filter-less Wavelength Division Multiplexing. 1-5 2020 CSNDSP https://doi.org/10.1109/CSNDSP49049.2020.9249495 conf/csndsp/2020 db/conf/csndsp/csndsp2020.html#HaighBCZGD20