Kishore Kothapalli Christian Scheideler Melih Onus Andréa W. Richa Constant density spanners for wireless ad-hoc networks. 116-125 2005 conf/spaa/2005 SPAA http://doi.acm.org/10.1145/1073970.1073987 db/conf/spaa/spaa2005.html#KothapalliSOR05