Chalermek Intanagonwiwat Ramesh Govindan Deborah Estrin Directed diffusion: a scalable and robust communication paradigm for sensor networks. 56-67 2000 conf/mobicom/2000 MOBICOM http://doi.acm.org/10.1145/345910.345920 db/conf/mobicom/mobicom2000.html#IntanagonwiwatGE00