Huan Song Byoung Whi Kim Biswanath Mukherjee Multi-thread polling: a dynamic bandwidth distribution scheme in long-reach PON. 134-142 2009 27 IEEE Journal on Selected Areas in Communications 2 http://dx.doi.org/10.1109/JSAC.2009.090205 db/journals/jsac/jsac27.html#SongKM09