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APA Citation
Ede, M., Endacott, J., Harper, M., & Rees, D. (2016). indexing chemical structures: Exemplified compound indexing in patents by the vendors Thomson Reuters, Chemical Abstracts and Elsevier – A comparative study by the Patent Documentation Group (PDG). World patent information, 44, 48–52. http://access.bl.uk/ark:/81055/vdc_100031413288.0x000007