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http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1046.1042
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1041.166
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.663.7328
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.414.3545
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.156.6500
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.580.6013
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.156.5335
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.156.557
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.414.1763
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.156.3185
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.388.2608
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.414.2016
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.156.6130
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.331.1565
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.156.3558
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.156.4210
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.398.8309
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.153.9951