The Role of Google Scholar in Evidence Reviews and Its Applicability to Grey Literature Searching

PO Larsen, 2010, The rate of growth in scientific publication and the decline in coverage provided by Science Citation Index, Scientometrics, 84, 575, 10.1007/s11192-010-0202-z

M Pautasso, 2012, Publication Growth in Biological Sub-Fields: Patterns, Predictability and Sustainability, Sustainability, 4, 3234, 10.3390/su4123234

RV Noorden, 2013, Open access: The true cost of science publishing, Nature, 495, 426, 10.1038/495426a

M Khabsa, 2014, The number of scholarly documents on the public web, PLOS ONE, 9, e93949, 10.1371/journal.pone.0093949

Collaboration for Environmental Evidence (CEE). Guidelines for Systematic Review and Evidence Synthesis in Environmental Management. Version 4.2. 2013. Environmental Evidence: <ext-link xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="uri" xlink:href="http://www.environmentalevidence.org/Documents/Guidelines/Guidelines4.2.pdf" xlink:type="simple">www.environmentalevidence.org/Documents/Guidelines/Guidelines4.2.pdf</ext-link>

Collins A, Miller J, Coughlin D, Kirk S. The Production of Quick Scoping Reviews and Rapid Evidence Assessments: A How to Guide—Joint Water Evidence Group. 2014: Beta Version 2.

Conservation Evidence. Synopses Methods. 2015. Available: <ext-link xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="uri" xlink:href="http://conservationevidence.com/site/page?view=methods" xlink:type="simple">http://conservationevidence.com/site/page?view=methods</ext-link>. Accessed 2015 Feb 24.

C Bernes, 2015, What is the influence on water quality in temperate eutrophic lakes of a reduction of planktivorous and benthivorous fish? A systematic review, Env Evid, 2, 9, 10.1186/2047-2382-2-9

NR Haddaway, 2015, Retrieving data for ecological syntheses: a grey area, Biol Cons

MD Jennions, 2002, Publication bias in ecology and evolution: an empirical assessment using the ‘trim and fill’ method, Biol Rev Camb Philos Soc, 77, 211, 10.1017/S1464793101005875

M Boeker, 2013, Google Scholar as replacement for systematic literature searches: good relative recall and precision are not enough, BMC Med Res Methodol, 13, 131, 10.1186/1471-2288-13-131

JC De Winter, 2014, The expansion of Google Scholar versus Web of Science: a longitudinal study, Scientometrics, 98, 1547, 10.1007/s11192-013-1089-2

JF Gehanno, 2013, Is the coverage of Google Scholar enough to be used alone for systematic reviews, BMC Med Inform Decis Mak, 13, 7, 10.1186/1472-6947-13-7

D Giustini, 2013, Google Scholar is not enough to be used alone for systematic reviews, Online J Public Health Inform, 5, 214, 10.5210/ojphi.v5i2.4623

E Delgado López‐Cózar, 2014, The Google Scholar Experiment: how to index false papers and manipulate bibliometric indicators, J Assoc Inf Sci Technol, 65, 446, 10.1002/asi.23056

Haddaway NR. The Use of Web-scraping Software in Searching for Grey Literature. The Grey Journal. In press.

M Shultz, 2007, Comparing test searches in PubMed and Google Scholar, Journal of the Medical Library Association: JMLA, 95, 442, 10.3163/1536-5050.95.4.442

J Reed, 2015, What are ‘Integrated Landscape Approaches’ and how effectively have they been implemented in the tropics: a systematic map protocol, 4, 2

KM Hughes, 2014, Investigating the effects of mobile bottom fishing on benthic biota: a systematic review protocol, Env Evid, 3, 23, 10.1186/2047-2382-3-23

D Roe, 2014, Which components or attributes of biodiversity influence which dimensions of poverty, Env Evid, 3, 3, 10.1186/2047-2382-3-3

J Garcia-Yi, 2014, What are the socio-economic impacts of genetically modified crops worldwide? A systematic map protocol, Env Evid, 3, 24, 10.1186/2047-2382-3-24

P Jacso, 2005, As we may search-Comparison of major features of the Web of Science, Scopus, and Google Scholar citation-based and citation-enhanced databases, Curr Sci Bangalore, 89, 1537

ME Falagas, 2008, Comparison of PubMed, Scopus, web of science, and Google scholar: strengths and weaknesses, FASEB, 22, 338, 10.1096/fj.07-9492LSF

SZ Shariff, 2013, Retrieving clinical evidence: a comparison of PubMed and Google Scholar for quick clinical searches, J Med Internet Res, 15, e164, 10.2196/jmir.2624

NR Haddaway, 2014, Evaluating effects of land management on greenhouse gas fluxes and carbon balances in boreo-temperate lowland peatland systems, Env Evid, 3, 5, 10.1186/2047-2382-3-5

S Savilaakso, 2014, Systematic review of effects on biodiversity from oil palm production, Env Evid, 3, 1, 10.1186/2047-2382-3-4

M Sciberras, 2013, Evaluating the biological effectiveness of fully and partially protected marine areas, Env Evid, 2, 1, 10.1186/2047-2382-2-4

AS Pullin, 2013, Human well-being impacts of terrestrial protected areas, Env Evid, 2, 19, 10.1186/2047-2382-2-19

NR Haddaway, 2014, Evidence on the environmental impacts of farm land abandonment in high altitude/mountain regions: a systematic map, Env Evid, 3, 17, 10.1186/2047-2382-3-17

R Whitlock, 2013, A systematic review of phenotypic responses to between-population outbreeding, Env Evid, 2, 13, 10.1186/2047-2382-2-13

C Bernes, 2015, What are the impacts of reindeer/caribou (Rangifer tarandus L.) on arctic and alpine vegetation?, Env Evid, 4, 4, 10.1186/s13750-014-0030-3

MA Banks, 2005, The excitement of Google Scholar, the worry of Google Print, Biomed Digit Libr, 2, 2, 10.1186/1742-5581-2-2

ME Anders, 2010, Comparison of PubMed and Google Scholar literature searches, Respir Care, 55, 578

J Gurevitch, 1999, Statistical issues in ecological meta-analyses, Ecology, 80, 1142, 10.1890/0012-9658(1999)080[1142:SIIEMA]2.0.CO;2

NR Haddaway, Shades of grey: two forms of grey literature important for reviews in conservation, Biol Conserv