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Figure 2. Distribution of articles in Journals

Literature review and theoretical model | 37

Figure 2. Distribution of articles in Journals.

Finally, with regard to the linkages among ESA-related subjects, three main clusters of keywords, extracted from the studied articles, were found in the present review4 (See Figure 3. Co-word patterns among reviewed articles).

4 “Co-word analysis is a content analysis technique that uses patterns of co-occurrence of pairs of items (i.e., words or noun phrases) in a corpus of texts to identify the relationships between ideas within the subject areas presented in these texts” (He, Q., 1999). Knowledge Discovery Through Co-Word Analysis. Library Trends, 48(1), 133–159.

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