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@online{Altmetric_2014,  author = {Altmetric},  title = {Expanding {How is  the Tracking of Impact of Books on the PlumX Platform},  organization = {Altmetric Knowledge Base} Altmetric score calculated?},  year = {2014},  url = {http://support.altmetric.com/knowledgebase/articles/83337-how-is-the-altmetric-score-calculated},  urldate = {2015-03-31},