The iCite: Citations module, also referred to as the Open Citation Collection (OCC) provides summary citation information and link-level data for journal publications within a defined analysis group (where an analysis group can consist of a single article or a very large group of articles). Citation links in the OCC, shown in the Citations module, are presently sourced from CrossRef, MedLine, PubMed Central, and Entrez. In addition to these, references are extracted and resolved with a machine learning pipeline from the full text of papers with open access version online, described in detail here. Therefore, this database has no restrictions on use or reuse and is public-domain.