“…Abramo and D'Angelo (2018 tracked international spillovers of Italian knowledge production, in over 200 fields, by analyzing publication citations. Abramo, D'Angelo, and Carloni (2019) conceptualized the diffusion of knowledge between countries in terms of a "balance of knowledge flows" (BKF). Several studies investigated, among others, the role of geographic, cognitive and social proximity in knowledge diffusion (Jaffe, Trajtenberg, & Henderson, 1993;Hicks, Breitzman, Olivastro & Hamilton, 2001;Tijssen, 2001;Maurseth & Verspagen, 2002;Ahlgren, Persson, & Tijssen, 2013;Head, Li, & Minondo, 2018;Wuestman, Hoekman, & Frenken, 2019, Abramo, D'Angelo, & Di Costa, 2020a.…”