Sven Oliver Krumke Rui Liu Errol L. Lloyd Madhav V. Marathe Ram Ramanathan S. S. Ravi Topology Control Problems under Symmetric and Asymmetric Power Thresholds. 187-198 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2865&spage=187 2003 conf/adhoc-now/2003 ADHOC-NOW db/conf/adhoc-now/adhoc-now2003.html#KrumkeLLMRR03