**4. The Bibliometric Review Based on Main Path Analysis**

The main path of research identified using CNA is shown in Figure 6 and included 21 articles. The evolution of the multifunctionality discussion in the scientific community can be divided into four periods, which have been defined as (1) bilateral beginning, (2) the ISO 14041 influence, (3) consequential LCA influence, and (4) ISO 14044 application.

**Figure 6.** The key-route main path of research on LCA multifunctionality (output from Pajek calculations), obtained from the citation network analysis.
