Economic and Environmental Geology

Indexed in /covered by CAS, KoreaScience & DOI/Crossref:eISSN 2288-7962   pISSN 1225-7281

Fig. 6.

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Fig. 6. Network structure of topics across two periods ((a) before 1994 and (b) after 1994). Nodes represent research topics and edges represent the degree of co-occurrence in abstracts and keyword sections.
Econ. Environ. Geol. 2021;54:353-64
© 2021 Econ. Environ. Geol.