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The Number of Scholarly Documents on the Public Web

Figure 1

To estimate the number of scientific documents on the web, , let equal the number of citations found in both Scholar and MAS for a collection of papers, and let be the number of citations reported by Scholar.

Then is an estimate of ,the fraction of documents indexed by MAS. The total number of documents N would be where is the size of MAS.

Figure 1

doi: https://doi.org/10.1371/journal.pone.0093949.g001