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HARVARD Citation
James, S. (2016) An introduction to data analysis using aggregation functions in R. [Online]. Cham, Switzerland : Springer. Available from: http://access.bl.uk/ark:/81055/vdc_100073627851.0x000001
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James, S. (2016) An introduction to data analysis using aggregation functions in R. [Online]. Cham, Switzerland : Springer. Available from: http://access.bl.uk/ark:/81055/vdc_100073627851.0x000001