Akio Koyama Ryoma Watanabe Leonard Barolli Makoto Takizawa R-MAC: A MAC Protocol for Power Reduction in Wireless Sensor Networks Based on Load Estimation and Its Performance Evaluation. 115-121 2011 INCoS http://doi.ieeecomputersociety.org/10.1109/INCoS.2011.144 conf/incos/2011 db/conf/incos/incos2011.html#KoyamaWBT11