Hopewell, S., & Clarke, M. (2004). Impact of grey literature on systematic reviews of randomized trials.
Citace podle Chicago (17th ed.)Hopewell, S., a M. Clarke. Impact of Grey Literature on Systematic Reviews of Randomized Trials. 2004.
Citace podle MLA (9th ed.)Hopewell, S., a M. Clarke. Impact of Grey Literature on Systematic Reviews of Randomized Trials. 2004.
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