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References
Garfield, E., Nature, 242, 485 (1973).
Garfield, E., Science, 178, 471 (1972).
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VALEN, L. Citation and Distinction. Nature 243, 250 (1973). https://doi.org/10.1038/243250b0
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DOI: https://doi.org/10.1038/243250b0