This post was first published on QWERTY: musings from the rabbit hole, a blog by Silvio Peroni A few months ago, I was invited to have a talk at the European Computer Science Symposium on an aspect of my research I particularly care about, that of open citations.

Guest post by Arcangelo Massari, University of Bologna In this post, Arcangelo Massari, who recently graduated in Digital Humanities and Digital Knowledge under Professor Silvio Peroni at the University of Bologna, shares the results of his master thesis. A particular problem in information retrieval is that of obtaining data from an evolving dataset, independent of the time at which that item of data was added, changed or removed.

Yesterday I gave a lightning talk at the 2021 OASPA Conference, with the title OpenCitations – what does the future hold? The poster accompanying my talk, published on Zenodo at https://doi.org/10.5281/zenodo.5526713, is reproduced below. Here is what I said: = = = Most of the talks at this conference have focussed on open access to textual content.

Today, we have published the bi-monthly release of COCI, the OpenCitations Index of Crossref open DOI-to-DOI citations.

We are now proud to announce the third release of COCI, which contains more than 624 million DOI-to-DOI citation links coming from both ‘the ‘Open’ and the ‘Limited’ sets of Crossref reference data.

Crowdsourcing open citations with CROCI An analysis of the current status of open citations, and a proposal **Author(s) **Ivan Heibi – ivan.heibi2@unibo.it Digital Humanities Advanced Research Centre (DHARC), Department of Classical Philology and Italian Studies, University of Bologna, Bologna, Italy Silvio Peroni – silvio.peroni@unibo.it Digital Humanities Advanced Research Centre (DHARC), Department of Classical Philology and

As introduced in a previous blog post, COCI is the OpenCitations Index of Crossref open DOI-to-DOI references, all released as CC0 material.