http://www.informit.com/articles/article.aspx?p=169575&seqNum=8

http://stackoverflow.com/questions/6799172/negative-weights-using-dijkstras-algorithm

http://stackoverflow.com/questions/5956534/dijkstras-algorithm-with-negative-weights

http://stackoverflow.com/questions/10462736/graph-dijkstra-for-the-single-source-longest-path

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