“…There are many computer programs available for building graphical maps based on bibliographic data (Cobo, Lopez-Herrera, Herrera-Viedma, & Herrera, 2011). Here, we used the visualization of similarities (VOS) viewer software developed by van Eck and Waltman (2010) to facilitate bibliometric mapping with visual reports, including bibliographic coupling relations, co-citation analysis, and co-occurrence of keywords (e.g., Laengle, Modak, Merigó, & Zurita, 2018;Merigó, Cancino, Coronado, & Urbano, 2016;Tang, Liao, & Su, 2018). Bibliographic coupling occurs when two papers cite the same third paper or overlap in the reference lists of publications (Cancino, Merigó, Coronado, Dessouky, & Dessouky, 2017;Kessler, 1963).…”