Bing Yang S. Q. Zheng Enyue Lu Finding Two Disjoint Paths in a Network with Normalized <i>alpha</i><sup>+</sup>-MIN-SUM Objective Function. 954-963 2005 conf/isaac/2005 ISAAC http://dx.doi.org/10.1007/11602613_95 db/conf/isaac/isaac2005.html#YangZL05