Quantifying the interdisciplinarity of a research is a relevant problem in the evaluative bibliometrics. The concept of interdisciplinarity is ambiguous and multidimensional. Thus, different measures of interdisciplinarity have been propose in the literature. However, few studies have proposed interdisciplinary metrics without previously defining classification sets, and no one use the co-citation network for this purpose. In this study we propose an interdisciplinary metric based on the co-citation network. This is a way to define the publication's field without resorting to pre-defined classification sets. We present a characterization of a publication's field and then we use this definition to propose a new metric of the interdisciplinarity degree for publications (papers) and journals as units of analysis. The proposed measure has an aggregative property that makes it scalable from a paper individually to a set of them (journal) without more than adding the numerators and denominators in the proportions that define this new indicator. Moreover, the aggregated value of two or more units is strictly among all the individual values.

中文翻译：

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基于共引网络的跨学科指标

量化研究的跨学科性是评价性文献计量学中的一个相关问题。跨学科的概念是模糊的和多维的。因此，文献中提出了不同的跨学科测量方法。然而，很少有研究在没有预先定义分类集的情况下提出跨学科指标，并且没有人为此目的使用共被引网络。在这项研究中，我们提出了一个基于共被引网络的跨学科指标。这是一种无需借助预定义分类集即可定义出版物字段的方法。我们提出了一个出版物领域的特征，然后我们使用这个定义提出了一个新的衡量出版物（论文）和期刊作为分析单位的跨学科程度的度量。提议的度量具有聚合特性，可以将其从单独的论文扩展到一组（期刊），而无需按照定义此新指标的比例添加分子和分母。此外，两个或多个单位的合计值严格属于所有单个值。