Scientific cooperation on an international level has been well studied in the literature. However, much less is known about this cooperation on the intercontinental level. In this paper, we address this issue by creating a collection of approximately 13.8 million publications around the papers by one of the highly cited author working in complex networks and their applications. The obtained rank-frequency distribution of the probability of sequences describing continents and number of countries -- with which authors of papers are affiliated -- follows the power law with an exponent -1.9108(15). Such a dependence is known in the literature as Zipf's law and it has been originally observed in linguistics, later it turned out that it is very commonly observed in various fields.

翻译：国际层面的科学合作已在文献中得到充分研究。然而，对于洲际层面的合作，我们所知甚少。本文通过构建约1380万篇论文的集合（围绕一位在复杂网络及其应用领域高被引作者的相关论文）来探讨这一问题。所得描述论文作者所属大洲及国家数量的序列概率的排名-频率分布遵循指数为-1.9108(15)的幂律。这种依赖关系在文献中被称为齐普夫定律（Zipf's law），最初在语言学中被发现，随后证实其在多个领域普遍存在。