Among them, the Yong Sik Ok and Dan Tsang had the closest relationship as diplayed in Figure 5. The close-up reveals the complex network of authors displayed in Table 2 with group members include Hailong Wang from Foshan University, Deyi Hou from Tsinghua, Sarkar Binoy from South Australia, Jorg Rinklebe from Wuppertal, Sabry Shaheen from Kafrelsheikh, Egypt. Other authors in this Yong Sik Ok group include: Amit Bahanatgar, Scott X Chang, Pavani Dissanayake, Ali El-Naggar, Muhammad Farooq, Avanthi Igalavithana, Kim Ki-Hyun, Dinish Moghan, Nabeel Khan Niazi, Patryk Oleszczuk, etc.
Qin et al. (2022) previously had exposed interconnected groups of authors who closely collaborate, with a central core consisting of Yong Sik Ok, Daniel C.W. Tsang, and Bin Gao, who maintain strong connections within a subgroup. This suggests that the majority of authors of highly cited papers are interconnected. All authors within this cluster have contributed more than 10 highly cited papers (See also group membership in Table 2).
The group that had some co-authorship with Ok and Tsang is the group led by Bin  Gao from Florida. The group led by Guangming Zeng had less relationship with Ok. While some researchers Johanness Lehmann and Stephen Joseph have some co-authorships with Yong Sik Ok.