Grey literature is any information that has not been formally published in books or journals, and as such it can be very difficult to find. Many government and organisational reports which could be useful and authoritative fall into this category. The Canadian Agency for Drugs and Technologies in Health (CADTH) has published a tool for finding health technology assessment grey literature from organisations across the world.
Grey Matters: a practical search tool for evidence based medicine provides a checklist to "ensure the retrieval of all relevant health technology assessment (HTA), government, and evidence-based agency reports that may not be indexed in bibliographic databases such as MEDLINE"
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