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Table 3 Systematic reviews of which more than ten included references were not retrieved in Google Scholar; performance of improved searches

From: The comparative recall of Google Scholar versus PubMed in identical searches for biomedical systematic reviews: a review of searches used in systematic reviews

  Number of included references Number of includes retrieved by
  Authors’ search Improved search #1 Improved search #2
Hasani 78 26 26 37
Novak 30 10 12 12
Verhoeven 89 72 75 72
Navarese 17 6 13 16
Belsey 20 10 15 16
  234 124 (53%) 141 (60%) 154 (66%)