Xu Jianqiu Victor Teixeira de Almeida Qin Xiaolin An Efficient Technique for Distance Computation in Road Networks. 888-893 2008 ITNG http://doi.ieeecomputersociety.org/10.1109/ITNG.2008.24 conf/itng/2008 db/conf/itng/itng2008.html#JianqiuAX08