“…Such maps allow several aspects of a scientific field to be monitored (Noyons et al, 1999; Su et al, 2019), providing a clearer view of the results obtained (Merigó et al, 2016). Keyword co-occurrence refers to the most common keywords used to develop a research field or a scientific document (Callon et al, 1983; Ding et al, 2001; Huang et al, 2019; McCain, 1986, 1991; Zhang et al, 2019), while co-citation assumes that there is some kind of association between two documents jointly cited by a different third one (Boyack & Klavans, 2014; Hoque et al, 2021; McCain, 1990; Ramos-Rodríguez & Ruíz-Navarro, 2004; Small, 1973).…”