“…In that manner, it can be used to identify historical root papers, which can describe the knowledge development of the scientific area being analysed. RPYS has been used in identifying historical roots or research milestones, for example, in academic efficacy studies (Rhaiem & Bornmann, 2018), commercialization of knowledge (Biranvand, Shabani, Asemi, & Cheshmeh Sohrabi, 2017), biomedical innovations (Comins & Leydesdorff, 2017), citation analysis (Hou, 2017), global warming and tea production (Marx, Haunschild, & Bornmann, 2017a), the role of climate in the collapse of the Mayan civilization (Marx, Haunschild, & Bornmann, 2017b), tribology (Elango, Bornmann, & Kannan, 2016), knowledge management (Khasseh & Mokhtarpour, 2016), global positioning systems (Comins & Hussey, 2015), and Higgs boson (Barth, Marx, Bornmann, & Mutz, 2014).…”