This paper defines and explores the direct citations between citing publications (DCCPs) of a publication. We construct an ego-centered citation network for each paper that contains all of its citing papers and itself, as well as the citation relationships among them. By utilizing a large-scale scholarly dataset from the computer science field in the Microsoft Academic Graph (MAG-CS) dataset, we find that DCCPs exist universally in medium and highly cited papers. For those papers that have DCCPs, DCCPs do occur frequently; highly cited papers tend to contain more DCCPs than others. Meanwhile, the number of DCCPs of papers published in different years does not vary dramatically. The current paper also discusses the relationship between DCCPs and some indirect citation relationships (e.g., co-citation and bibliographic coupling).

中文翻译：

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探索引用出版物之间的直接引用

本文定义并探讨了出版物的引用出版物 (DCCP) 之间的直接引用。我们为每篇论文构建一个以自我为中心的引文网络，其中包含其所有被引论文及其本身，以及它们之间的引文关系。通过利用 Microsoft Academic Graph (MAG-CS) 数据集中计算机科学领域的大规模学术数据集，我们发现 DCCP 在中等和高被引论文中普遍存在。对于那些有DCCPs的论文，DCCPs确实经常出现；高被引论文往往比其他论文包含更多的 DCP。同时，不同年份发表论文的DCCPs数量并没有太大差异。本论文还讨论了 DCCP 与一些间接引用关系（例如，共引和书目耦合）之间的关系。