Table 1.

Summary of methodological choices.

Map/figure	Analysis	Unit	Inclusion threshold(s)	Resulting nodes	Notes
Co-word (Figure 3)	Co-occurrence	Keywords	Occurrences ≥ 15; minimum cluster size = 10	79	Standard clustering resolution used
Co-citation (Figure 5)	Co-citation	Cited documents	Citations ≥ 35	93	Intellectual base map
Co-authorship (authors) (Figure 6)	Co-authorship	Authors	Documents ≥ 3 and Citations ≥ 10	330	Isolates removed only in figures
Co-authorship (countries) (Figure 7)	Co-authorship	Countries	Documents ≥ 10 and Citations ≥ 20	49	Isolates removed only in figures
Co-citation (sources) (Figure 8)	Co-citation	Sources (journals)	Citation threshold adjusted for interpretable size	151	Dense structure with strong link strengths
Co-authorship (organizations) (Figure 9)	Co-authorship	Organizations	Thresholds as applied in the figure	148	Graph sized to 100–200 nodes for interpretability; isolates removed only in figures.