Giacomo Bernardi Peter Buneman Mahesh K. Marina Tegola tiered mesh network testbed in rural Scotland. 9-16 2008 Wireless Networks and Systems for Developing Regions http://doi.acm.org/10.1145/1410064.1410067 conf/mobicom/2008winsdr db/conf/mobicom/winsdr2008.html#BernardiBM08