Table 4.

Top five publications for co-citation and centrality.

Rank	Co-citation counts	Co-citation references	Rank	Centrality	Co-citation references
1	23	Zhou et al., 2015	1	0.24	Feng et al., 2015
2	22	Deng and Wang 2016	2	0.18	Wang et al., 2015
3	20	Tan et al., 2017	3	0.11	Chen et al., 2015
4	19	Feng et al., 2013	4	0.09	Lin et al., 2015
5	18	Wang et al., 2015	5	0.09	Dhond et al., 2008