@article{article, title  = {{The high scholarly value of grey literature before and during Covid-19}},

 publisher = {{Springer Science and Business Media LLC}},

 url = {{http://dx.doi.org/10.1007/s11192-022-04398-3 }},

 year = {{2022}},

 month = {{5}},

 author = {{Kousha K and Thelwall M and Bickley M}},

 doi = {{10.1007/s11192-022-04398-3}},

 volume = {{127}},

 journal = {{Scientometrics}},

 issue = {{6}},

 pages = {{3489-3504}},

 note = {{Accessed on 2024/09/19}}}