[tag=DT] [lemma=source] [□]
[tag=DT] [lemma=source] [□=□]
[tag=DT] [lemma=source] [!□]
Many records from key journals published since 2001 include the references cited in the bibliography of the source article , and each of the individual references may also have links to an abstract and / or to other papers that cite it . Abstracts range from 50 to 300 words and describe the content and scope of the source articles .