**3.6 Keywords top authors and sources relations**

In **Figure 6** a three fields graph represented the relationships between the keywords, the main authors' keywords and the sources. Therefore, the diagram of rectangles with distinct colors illustrated the main elements. The value of the sum of the relations appearing between the element represented by the rectangles and the diagram of the other elements designed the height of the rectangles. The size of the rectangles depends on more relations the element had.

The analysis showed in which research topics of the bioeconomy concept the authors of bioeconomy publications had explored and which sources they had most often published. The research topics were considered here as the keywords of the authors.

**Figure 5.** *Author keywords co-occurrence network in the COVID literature.*

**Figure 6.** *Relationships between author keywords (left), authors (middle) and source (right).*

*The Economic, Climate Change and Public Health Edges of the Geopolitics of COVID-19… DOI: http://dx.doi.org/10.5772/intechopen.96797*
