Feng Chen Thomas Talanis Reinhard German Falko Dressler Real-time enabled IEEE 802.15.4 sensor networks in industrial automation. 136-139 2009 SIES http://dx.doi.org/10.1109/SIES.2009.5196207 conf/sies/2009 db/conf/sies/sies2009.html#ChenTGD09