Coverage of DOAJ journals' citations through OpenCitations - Protocol v2

This is the protocol for the research of the coverage of DOAJ journals' citations through OpenCitations. Our goal is to find out: about the coverage of articles from open access journals in DOAJ journals as citing and cited articles, how many citations do DOAJ journals receive and do, and how many of these citations involve open access articles as both citing and cited entities, as well as the presence of trends over time of the availability of citations involving articles published in open access journals in DOAJ journals. Our research focuses on DOAJ journals exclusively, using OpenCitations as a tool. Previous research has been made on open citations using COCI (Heibi, Peroni & Shotton 2019), and on DOAJ journals' citations (Saadat and Shabani 2012), paving the grounds for our present analysis. After careful considerations on the best way to retrieve data from DOAJ and OpenCitations, we opted for downloading the public data dumps. Using the API resulted in a way too long running time, and the same problem arose for using the SPARQL endpoint of OpenCitations. Minimal Bibliography Björk, B.-C.; Kanto-Karvonen, S.; Harviainen, J.T. "How Frequently Are Articles in Predatory Open Access Journals Cited." Publications, 8, 17. (2020) https://doi.org/10.3390/publications8020017 Heibi, I.; Peroni, S.; Shotton, D. "Crowdsourcing open citations with CROCI -- An analysis of the current status of open citations, and a proposal" arXiv:1902.02534 (2019) https://doi.org/10.48550/arXiv.1902.02534 Pandita, R., & Singh, S. "A Study of Distribution and Growth of Open Access Research Journals Across the World. Publishing Research Quarterly" (2022), 38(1), 131–149. https://doi.org/10.1007/s12109-022-09860-x Saadat, R., A. Shabani. "Investigating the citations received by journals of Directory of Open Access Journals from ISI Web of Science’s articles." International Journal of Information Science and Management (IJISM) 9.1 (2012): 57-74. Solomon, D. J., Laakso, M., Björk, B.-C. "A longitudinal comparison of citation rates and growth among open access journals", Journal of Informetrics, 7, 3 (2013): 642-650. https://doi.org/10.1016/j.joi.2013.03.008.