Binay K. Bhattacharya Yuzhuang Hu Qiaosheng Shi Evangelos Kranakis Danny Krizanc Sensor network connectivity with multiple directional antennae of a given angular sum. 1-11 2009 IPDPS http://dx.doi.org/10.1109/IPDPS.2009.5160982 conf/ipps/2009 db/conf/ipps/ipdps2009.html#BhattacharyaHSKK09