Co-authorship is an important aspect of scientific collaboration that contributes to the creation of quality research and the expansion of scientific discourse. Co-authored articles are readily accepted by the Scopus and Web of Science databases and are valued more by the international scientific community due to the diversity of approaches and strategies used by researchers in collaborative research. Today's article describes the types of co-authorship and the key requirements for such papers set by Scopus/Web of Science databases.

Types of co-authorship in Scopus and Web of Science
Co-authorship in scientific articles indexed in Scopus and Web of Science databases can take different forms, depending on the contribution and participation of the authors. The main types of co-authorship include:
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International co-authorship: articles written in collaboration with scholars from different countries. This co-authorship often indicates a high level of international collaboration and can increase the ranking and visibility of the work.
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Interdisciplinary co-authorship: this type of co-authorship promotes the integration of different scientific approaches and methods, allowing complex scientific problems that cannot be unraveled within a single discipline to be solved. Such works are of greater interest to the global scientific community and are cited more frequently.
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Intra-institutional co-authorship: involves authors from the same institution or university. In this case, the results of the paper are influenced not only by personal research, but also by resources and support from the research institution.
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Senior author and research leader: This is usually the first author (the one who did the bulk of the work) and the last author (most often the research or project leader). This structure reflects each author's contribution to the work.
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The degree of individual responsibility of the authors:
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Separate co-authorship: the contribution of each author is clearly delineated in separate blocks/sections
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undivided co-authorship: authors work together on all aspects of the paper, from problem formulation to writing conclusions.
Key Scopus and Web of Science requirements for co-authorship
The key requirements for co-authorship in articles published in journals indexed in Scopus and Web of Science include the following aspects:
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adherence to publication ethics, high originality of the text, absence of plagiarism and repetition of existing research results
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the number of co-authors should be no more than 5 people, optimally 2-3 co-authors
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significant contribution to the study by each of the co-authors, this can be conceptualization, data collection and analysis, interpretation of the results or writing a specific section of the article.
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meeting the requirements of a particular journal: each journal has its own criteria that researchers must adhere to (structure of the list of authors, description of their contribution and confirmation that all scientists agree on the content of the article and its submission to the journal).
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Indication of each author's contribution: some journals require a description of each scientist's contribution to the paper to avoid controversy and ensure transparency. This can be an explanation of which authors were involved in specific aspects of the research.
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