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WikiPedia: Hạt_điểm http://cerncourier.com/cws/article/cern/29724 http://ea.grolier.com/article?id=0303750-00 http://ea.grolier.com/article?id=0325780-00 http://scienceworld.wolfram.com/physics/PointCharg... http://www.ccsenet.org/journal/index.php/apr/artic... //dx.doi.org/10.1088%2F0370-1328%2F86%2F3%2F301 //dx.doi.org/10.1119%2F1.17716 //dx.doi.org/10.5539%2Fapr.v7n6p138 https://scienceworld.wolfram.com/physics/ElectronR... https://wayback.archive-it.org/all/20130401135900/...