Feng Xia Ruonan Hao Yang Cao Lei Xue ART-GAS: an adaptive and real-time GTS allocation scheme for IEEE 802.15.4. 96-103 2011 AINTEC http://doi.acm.org/10.1145/2089016.2089032 conf/aintec/2011 db/conf/aintec/aintec2011.html#XiaHCX11