Twenty-First International Conference on Grey Literature 'Open Science Encompasses New Forms of Grey Literature'. - German National Library of Science and Technology, Hannover, Germany on October 22-23 October 2019 / compiled by D. Farace and J. Frantzen ; GreyNet International, Grey Literature Network Service. – Amsterdam : TextRelease, February 2020. – 173 p. – Author Index. – (GL Conference Series, ISSN 1386-2316 ; No. 21).
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